Method for judging vehicle collision

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.

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.