Patent ID: 7937241

Claim:
A method comprising: at a detection unit fitted to a vehicle seat, detecting acceleration values in the x, y, and z-axes at preset intervals of time; detecting an increase of cumulated acceleration values over time; calculating a time from when a predetermined permitted maximum of the cumulated acceleration values will be reached based on the detected acceleration values and increase of acceleration values, wherein detecting increase of the acceleration values cumulated over time includes calculating a first cumulative acceleration value at a first point in time and a second cumulative acceleration value at a second point in time, and calculating the difference between the second and first acceleration values and the difference between second and first points in time of a section of a curve of the cumulative acceleration values entered in a diagram to determine rise over time; determining a residual running time from the time when the increase is determined until the time when maximum is expected to be reached; and comparing the determined residual running time with remaining time of a preset minimum period of time within which the cumulative acceleration values will not yet reach the permitted maximum.