Vehicle occupant weight classification system
First Claim
1. A method for determining vehicle occupant characteristics to classify vehicle occupants comprising the steps of:
- (a) establishing a first position for at least one occupant sensor;
(b) recognizing a second position that is different than the first position wherein the first position comprises an original sensor position and the second position comprises a subsequent sensor position that is offset from the original sensor position;
(c) using an information factor to determine a difference between the first and second positions by using a measuring function to evaluate the offset; and
(d) generating a correction factor to correct for the offset.
1 Assignment
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Accused Products
Abstract
A vehicle occupant classification system categorizes vehicle occupants into various classes such as adult, child, infant, etc. to provide variable control for a vehicle restraint system such as an airbag. The classification system utilizes sensors that are installed in various locations in the vehicle. The sensors are used to generate a three-dimensional profile for the vehicle occupant. Various factors can affect the accuracy of this three-dimensional profile. Fuzzy logic is used to reduce some of the inaccuracies by providing multiple decision levels for various stages of the classification. Inaccuracies are also caused by sensors shifting within the system from their original position. This condition creates offset and the system evaluates this offset and generates a correction factor to provide a more accurate three-dimensional profile. Electrically erasable programmable read-only memory is used to reduce complications and inaccuracies associated with seat occupant weight sensors that have mounting configurations that vary depending upon the vehicle.
35 Citations
17 Claims
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1. A method for determining vehicle occupant characteristics to classify vehicle occupants comprising the steps of:
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(a) establishing a first position for at least one occupant sensor; (b) recognizing a second position that is different than the first position wherein the first position comprises an original sensor position and the second position comprises a subsequent sensor position that is offset from the original sensor position; (c) using an information factor to determine a difference between the first and second positions by using a measuring function to evaluate the offset; and (d) generating a correction factor to correct for the offset. - View Dependent Claims (2, 3, 4)
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5. A method for determining vehicle occupant characteristics to classify vehicle occupants comprising the steps of:
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(a) establishing a first position for at least one occupant sensor; (b) recognizing a second position that is different than the first position; (c) using an information factor to determine a difference between the first and second positions; (d) generating a correction factor to correct for the difference; and (e) defining an occupant position by positioning an occupant on a seat, generating a first plurality of occupant signals from the at least one occupant sensor, generating a three-dimensional profile based on the first plurality of occupant signals, and classifying the occupant based on the three-dimensional profile. - View Dependent Claims (6, 7, 8)
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9. A method for determining vehicle occupant characteristics to classify vehicle occupants comprising the steps of:
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(a) establishing a first position for at least one occupant sensor wherein the at least one occupant sensor comprises a plurality of occupant sensors mounted within a vehicle for generating a plurality of occupant signals, and including generating at least one initial occupant sensor value with the first position being defined as an initial sensor position arrangement based on the occupant sensor value; (b) recognizing a second position that is different than the first position; (c) using an information factor to determine a difference between the first and second positions, including generating the information factor based on the initial occupant sensor value, generating a three-dimensional occupant profile based on the plurality of occupant signals, comparing the information factor to the three-dimensional occupant profile, identifying variance when a current occupant sensor value varies from the initial occupant sensor value, defining the second position as a shifted sensor position arrangement once variance is identified, and determining an amount of variance between the initial and shifted sensor position arrangements; (d) generating a correction factor to correct for the difference by applying the correction factor to a current three-dimensional occupant profile to generate a corrected three-dimensional occupant profile; and (e) classifying the seat occupant based on the corrected three-dimensional occupant profile.
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10. A method for determining vehicle occupant characteristics to classify vehicle occupants comprising the steps of:
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(a) establishing a first position for at least one occupant sensor wherein the first position comprises an original sensor arrangement, and including generating a first plurality of occupant signals from the at least one occupant sensor; (b) recognizing a second position that is different than the first position, and including generating an actual position of a three-dimensional profile based on the first plurality of occupant signals to comprise the second position, (c) using an information factor to determine a difference between the first and second positions, and including comparing the actual position to original sensor arrangement to determine an offset; and (d) generating a correction factor to correct for the difference by using a measuring function to evaluate the offset and preparing the correction factor to correct the three-dimensional profile.
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11. A method for determining vehicle occupant characteristics to classify vehicle occupants comprising the steps of:
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(a) establishing a first position for at least one occupant sensor, generating a first plurality of occupant signals from the at least one occupant sensor, and generating a three-dimensional profile based on the first plurality of occupant signals to define the first position; (b) recognizing a second position that is different than the first position; (c) using an information factor to determine a difference between the first and second positions, providing the information factor with a predefined sensor arrangement that defines the second position, and using the information factor to determine a difference between the first and second positions to determine an offset; and (d) generating a correction factor to correct for the difference. - View Dependent Claims (12)
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13. A method for determining vehicle occupant characteristics to classify vehicle occupants comprising the steps of:
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(a) establishing a first position for at least one occupant sensor wherein the at least one occupant sensor comprises at least a plurality of weight sensors, and including installing the weight sensors in an initial sensor arrangement to define the first position, generating a first plurality of occupant signals from the weight sensors, and generating a three-dimensional profile based on the first plurality of occupant signals; (b) recognizing a second position that is different than the first position; (c) using an information factor to determine a difference between the first and second positions wherein the information factor includes a virtual sensor matrix having a predefined number of virtual weight sensor positions that are greater in number than a number of sensors in the initial sensor arrangement, and including dividing the weight sensors into a plurality of zones with each zone defined as covering a subset of virtual weight sensor positions, assigning each zone a reference cell for compiling weight signals from that zone to generate a weight zone signal, mapping each weight zone signal in the virtual sensor matrix such that all virtual weight sensor positions are filled forming a subsequent sensor arrangement to define the second position; and (d) generating a correction factor to correct for the difference. - View Dependent Claims (14)
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15. A method for determining vehicle occupant characteristics to classify vehicle occupants comprising the steps of:
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(a) establishing a first position for at least one occupant sensor wherein the at least one occupant sensor comprises a plurality of occupant sensors, and including generating a plurality of occupant measurement signals and generating a three-dimensional profile for occupant classification based on the plurality of occupant measurement signals; (b) recognizing a second position that is different than the first position; (c) using an information factor to determine a difference between the first and second positions, including comparing the information factor to the three-dimensional profile; and (d) generating a correction factor to correct for the difference, including generating the correction factor if the three-dimensional profile varies from the information factor by a predetermined amount. - View Dependent Claims (16, 17)
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Specification