Method for judging vehicle collision
First Claim
1. A method for judging vehicle collision, comprising the steps of:
- sampling output signals from an acceleration sensor carried on a vehicle at a predetermined sampling cycle;
collecting sampled data in an amount corresponding to a plurality of predetermined continuous sampling cycles to obtain a data group corresponding to an interval window;
preparing said data groups corresponding to said interval windows each of which is successively delayed by one sampling cycle;
decomposing each of said data groups corresponding to each of said interval windows into frequency components in accordance with Hadamard transform; and
judging said vehicle collision on the basis of a level value of said decomposed frequency component.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for judging vehicle collision in which an output signal from an acceleration sensor carried on a vehicle, which is obtained from a time of start of judgment on collision, is outputted through interval windows each having a predetermined time width of a plurality of sampling cycles and provided as those successively delayed by one sampling cycle respectively. A waveform of the output signal is Hadamard-transformed and decomposed into frequency components for each of the interval windows by using an Hadamard-transforming unit. A threshold value set for a predetermined frequency component and outputted from a threshold-outputting unit is compared with a level value of the predetermined frequency component selected from the frequency components obtained by the decomposition in the Hadamard-transforming unit, by using a collision-judging unit. Occurrence of collision of the vehicle is judged on the basis of a result of the comparison.
29 Citations
12 Claims
-
1. A method for judging vehicle collision, comprising the steps of:
-
sampling output signals from an acceleration sensor carried on a vehicle at a predetermined sampling cycle; collecting sampled data in an amount corresponding to a plurality of predetermined continuous sampling cycles to obtain a data group corresponding to an interval window; preparing said data groups corresponding to said interval windows each of which is successively delayed by one sampling cycle; decomposing each of said data groups corresponding to each of said interval windows into frequency components in accordance with Hadamard transform; and judging said vehicle collision on the basis of a level value of said decomposed frequency component.
-
-
2. A method for judging vehicle collision, comprising the steps of:
-
sampling output signals from an acceleration sensor carried on a vehicle at a predetermined sampling cycle; collecting sampled data in an amount corresponding to a plurality of predetermined continuous sampling cycles to obtain a data group corresponding to an interval window; preparing said data groups corresponding to said interval windows each of which is successively delayed by one sampling cycle; decomposing each of said data groups corresponding to each of said interval windows into frequency components in accordance with Hadamard transform; comparing a level value of said decomposed frequency component with a predetermined threshold value set for said frequency component; and judging occurrence of said vehicle collision on the basis of a result of said comparison.
-
-
3. A method for judging vehicle collision, comprising the steps of:
-
determining collision reference data on the basis of an output signal from an acceleration sensor provided on a vehicle; determining a collision judgment threshold on the basis of a value of said determined collision reference data; decomposing a waveform of said output signal from said acceleration sensor into frequency components, using a level value of each predetermined frequency component selected from said decomposed frequency components, as collision judgment data; and judging occurrence of collision if said value of said collision judgment data exceeds said collision judgment threshold. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification