Patent US1633074A successfully refreshed from Google Patents.
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Method and apparatus for sensing a vehicle crash in real time using a frequency domain summation algorithm
Assignee: ZF Passive Safety Systems US Inc
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Filing: 1990-04-04
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Granted: 1991-11-12
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Expires: 2010-04-04
Abstract
Abstract A method and apparatus is disclosed for controlling actuation of a passenger restraint system in a vehicle. The apparatus includes an accelerometer for providing a time domain vibratory electric signal having frequency components indicative of a vehicle crash condition. An A/D converter converts the accelerometer signal into a digitized signal. A fast Fourier transform device transforms the digitized time domain vibratory electric signal over at least two time intervals into frequency domain signals. The amplitudes of corresponding frequency bins of the frequency domain signals are summed over the entire frequency spectrum, bin-to-bin. A microcomputer monitors the sum of the amplitudes of at least one selected frequency bin of the frequency domain signals and actuates the passenger restraint system when the sum is greater than a predetermined threshold thereby indicating a particular type of vehicle crash is occurring.
Inventors
- 👤 Joseph F. Mazur
- 👤 Brian K. Blackburn
- 👤 Scott B. Gentry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:04
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/01; B60R21/013; B60R21/0132; B60R21/01332; B60R21/01334
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
111 words
An apparatus for controlling actuation of a passenger restraint system in a vehicle, said apparatus comprising: sensing means for providing a time domain vibratory electric signal having frequency components indicative of a vehicle crash condition; means for transforming the time domain vibratory electric signal over at least two time intervals into associated frequency domain signals; means for summing at least one frequency component of one frequency domain signal with at least one frequency component of the other frequency domain signal; means for actuating the passenger restraint system when the summation of said at least one frequency components of the frequency domain signals indicates a predetermined type of vehicle crash is occurring.
Claim 2
Independent Claim
111 words
An apparatus for controlling actuation of a passenger restraint system in a vehicle, said apparatus comprising: sensing means for providing a time domain vibratory electric signal having frequency components indicative of a vehicle crash condition; means for transforming the time domain vibratory electric signal over at least two time intervals into associated frequency domain signals; means for summing at least one frequency component of one frequency domain signal with at least one frequency component of the other frequency domain signal; means for actuating the passenger restraint system when the summation of said at least one frequency components of the frequency domain signals indicates a predetermined type of vehicle crash is occurring.
Claim 3
Dependent Claim
39 words
The apparatus of claim 1 wherein the means for transforming the time domain vibratory electric signal includes means for converting said vibratory electric signal into a digital signal and a digital transform processor connected to the means for converting.
Claim 4
Dependent Claim
27 words
The apparatus of claim 2 wherein said means for converting is an analog to digital converter and wherein said digital transform processor is a fast Fourier transformer.
Claim 5
Dependent Claim
31 words
The apparatus of claim 3 wherein said fast Fourier transformer provides 128 transform values over a predetermined frequency spectrum and wherein said at least two time intervals overlap by seventy-five percent.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1 wherein said passenger restraint system includes an airbag.
Claim 7
Dependent Claim
70 words
The apparatus of claim 1 wherein said means for transforming the time domain vibratory electric signal into a frequency domain signal includes means for delaying subsequent transformations by a predetermined time delay and wherein said means for summing sums at least one selected frequency component of a present frequency domain signal with a corresponding frequency component of the time delayed frequency domain signal and provides a summation signal indicative thereof.
Claim 8
Dependent Claim
74 words
The apparatus of claim 2 further including memory means for storing a predetermined frequency domain amplitude signal indicative of a predetermined crash condition at a predetermined time and further including means for comparing the sum of the frequency domain signals against the stored predetermined frequency domain amplitude signal, said means for actuating said passenger restraint system when the sum of the frequency domain signals is greater than the stored predetermined frequency domain amplitude signal.
Claim 9
Dependent Claim
19 words
The apparatus of claim 1 wherein the at least two time intervals are the same length and partially overlap.
Claim 10
Dependent Claim
30 words
The apparatus of claim 1 wherein said means for summing provides a sum of the amplitudes of corresponding frequency components of the frequency domain signals over the predetermined frequency spectrum.
Claim 11
Dependent Claim
37 words
The apparatus of claim 1 wherein said sensing means is a mass suspended by cantilever members from a frame secured to the vehicle so that said mass vibrates when the vehicle is subjected to a crash condition.
Claim 12
Dependent Claim
50 words
The apparatus of claim 1 wherein said means for actuating further includes means for determining which of a plurality of specific types of vehicle crash conditions is occurring from the sum of the frequency domain signals and means for delaying actuation in accordance with the determined type of vehicle crash.
Claim 13
Independent Claim
106 words
A method for controlling actuation of a passenger restraint system in a vehicle, said method comprising the steps of: providing a time domain vibratory electric signal having frequency components indicative of a vehicle crash condition; transforming the time domain vibratory electric signal over at least two time intervals into associated frequency domain signals; summing at least one frequency component of one frequency domain signal with at least one frequency component of the other frequency domain signal; and actuating the passenger restraint system when the summation of said at least one frequency components of the frequency domain signals indicates a predetermined type of vehicle crash is occurring.
Claim 14
Independent Claim
106 words
A method for controlling actuation of a passenger restraint system in a vehicle, said method comprising the steps of: providing a time domain vibratory electric signal having frequency components indicative of a vehicle crash condition; transforming the time domain vibratory electric signal over at least two time intervals into associated frequency domain signals; summing at least one frequency component of one frequency domain signal with at least one frequency component of the other frequency domain signal; and actuating the passenger restraint system when the summation of said at least one frequency components of the frequency domain signals indicates a predetermined type of vehicle crash is occurring.
Claim 15
Dependent Claim
37 words
The method of claim 12 wherein the step of transforming the time domain vibratory electric signal is provided by a digital transform processor and includes the step of converting said vibratory electric signal into a digital signal.
Claim 16
Dependent Claim
30 words
The method of claim 12 wherein the step of converting includes converting an analog signal into a digital signal and wherein the step of transforming includes performing a Fourier transform.
Claim 17
Dependent Claim
28 words
The method of claim 14 wherein the step of transforming includes providing 128 transform values and wherein said at least two time intervals are overlapped by seventy-five percent.
Claim 18
Dependent Claim
21 words
The method of claim 12 wherein the step of actuating the passenger restraint system includes the step of actuating an airbag.
Claim 19
Dependent Claim
72 words
The method of claim 12 wherein the step of transforming the time domain vibratory electric signal into a frequency domain signal includes the step of delaying subsequent transformations by a predetermined time delay and wherein the step of summing includes summing at least one selected frequency component of a present frequency domain signal with a corresponding frequency component of the time delayed frequency domain signal and providing a summation signal indicative thereof.
Claim 20
Dependent Claim
78 words
The method of claim 13 further including the step of storing a predetermined frequency domain amplitude signal indicative of a predetermined crash condition at a predetermined time and further including the step of comparing the sum of the frequency domain signals against the stored predetermined frequency- domain amplitude signal and wherein the step of actuating actuates said passenger restraint system when the sum of the frequency domain signals is greater than the stored predetermined frequency domain amplitude signal.
Claim 21
Dependent Claim
17 words
The method of claim 12 further including the step of overlapping the at least two time intervals.
Claim 22
Dependent Claim
29 words
The method of claim 12 wherein the step of summing provides a sum of the amplitudes of corresponding frequency components of the frequency domain signals over a frequency spectrum.
Claim 23
Dependent Claim
47 words
The method of claim 12 wherein the step of actuating the passenger restraint system further includes the step of determining which of a plurality of specific types of vehicle crash is occurring and the step of delaying actuation in accordance with the determined type of vehicle crash.
References Cited (Backward Citations)
US3573446A
Cited
US3762495A
Cited
US3870894A
Cited
US3851162A
Cited
US4087782A
Cited
US4410875A
Cited
US4293921A
Cited
US4408284A
Cited
US4497025A
Cited
US4615027A
Cited
US4507705A
Cited
US4638179A
Cited
US4684928A
Cited
US4777605A
Cited
US4805101A
Cited
US4805456A
Cited
US4842301A
Cited
US4975850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |