Acceleration Measuring Device
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Abstract
The present invention relates to an acceleration measuring device capable of acquiring the offset for correcting the output of a triaxial acceleration sensor. The invention is provided with an acceleration sensor for detecting the acceleration in a triaxial direction, a data acquisition portion for acquiring the triaxial output data, a data selecting portion for judging whether repeatedly acquired triaxial output data are appropriate to make a selection, a data accumulating portion for accumulating the thus selected triaxial output data, a reference point estimating portion estimating coordinate values of the reference point determined in the three-dimensional cartesian space by referring to the distribution of a predetermined number of accumulated triaxial output data in a three-dimensional cartesian space when each axial component is given as a coordinate value, and an offset correction/calculation portion for correcting the offset of the triaxial output data of the acceleration sensor.
16 Citations
47 Claims
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1-26. -26. (canceled)
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27. An acceleration measuring device comprising an acceleration sensor for detecting the acceleration in a biaxial or a triaxial direction;
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an output data acquisition means for acquiring biaxial or triaxial output data of the acceleration sensor;
an output data selecting means for regarding the output data acquired by the output data acquisition means as a reference output data, calculating a difference with respect to the reference output data each time the output data are acquired by the output data acquisition means, and checking the difference value and its state of continuity, thereby judging whether the acceleration sensor is kept stationary or in uniform motion to select the output data;
an output data accumulating means for accumulating the output data selected by output data selecting means;
a reference point estimating means in which the distribution of a predetermined number of output data accumulated by the output data accumulating means in a two-dimensional or a three-dimensional cartesian space when each axial component is given as a coordinate value is referenced to estimate coordinate values of a reference point determined on the cartesian space; and
an offset correcting means for correcting the offset of the output data of the acceleration sensor on the basis of the coordinate values of the reference point estimated by the reference point estimating means. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification