ACCELERATION SENSOR DEVICE

PROBLEM TO BE SOLVED: To provide an acceleration sensor device capable of detecting the acceleration direction even in the case where an initial value is unknown with a constitution having wide versatility. SOLUTION: An output from an acceleration sensor 1 is amplified by an amplifying circuit 2 and digitized by an A/D converter, and the output is subjected to operation processing by an operation processing part 33. The operation processing part 33 has a pre-processing part for operating a measured value from which an offset of the acceleration sensor 1 is removed, the first and second storage parts for storing measured values in the first and second static states, the third storage part for storing a measured value in the moving state from the first static state to the second static state, an interpolation calculation part for calculating a measuring predicted value at the same timing as the moving state by performing linear interpolation of the measured values in the first and second static states stored in the first and second storage parts, and a direction determination part for determining the acceleration direction by comparing the magnitude of the measuring predicted value calculated by the interpolation calculation part with the magnitude of the measured value in the moving state stored in the third storage part. COPYRIGHT: (C)2006,JPO&NCIPI