Acceleration measuring device
First Claim
1. An acceleration measuring device comprising a triaxial acceleration sensor having orthogonal X, Y and Z measurement axes, comprising:
- an output data acquisition means for acquiring output data of said acceleration sensor;
an output data selecting means for calculating a difference in values between said output data over time and for checking the state of continuity of those values to judge whether said acceleration sensor is kept stationary or in uniform motion;
an output data accumulating means for accumulating selected output data;
an output data identifying means for identifying the maximum and minimum axial components of said selected output data alone said X, Y, and Z measurement axes and further alone additional axes which are defined as linear coupling of X, Y, and Z measurement axes;
a reference point estimating means in which said selected output data and said identified maximum and minimum axial components are used to estimate the coordinate values of a reference point; and
an offset correcting means for correcting the offset of output data of the acceleration sensor on the basis of the coordinate values of said reference point.
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Accused Products
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.
15 Citations
17 Claims
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1. An acceleration measuring device comprising a triaxial acceleration sensor having orthogonal X, Y and Z measurement axes, comprising:
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an output data acquisition means for acquiring output data of said acceleration sensor; an output data selecting means for calculating a difference in values between said output data over time and for checking the state of continuity of those values to judge whether said acceleration sensor is kept stationary or in uniform motion; an output data accumulating means for accumulating selected output data; an output data identifying means for identifying the maximum and minimum axial components of said selected output data alone said X, Y, and Z measurement axes and further alone additional axes which are defined as linear coupling of X, Y, and Z measurement axes; a reference point estimating means in which said selected output data and said identified maximum and minimum axial components are used to estimate the coordinate values of a reference point; and an offset correcting means for correcting the offset of output data of the acceleration sensor on the basis of the coordinate values of said reference point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for measuring acceleration, the method being executed by an acceleration measuring device and comprising:
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providing in said measuring device a triaxial acceleration sensor having orthogonal X, Y, and Z measurement axes, said measuring device; acquiring output data of said acceleration sensor; calculating a difference in values between said output data over time; checking the state of continuity of those values to judge whether said acceleration sensor is kept stationary or in uniform motion; accumulating and selecting output data when said difference is less than a predetermined amount; identifying the maximum and minimum axial components of said selected output data along said X, Y, and Z measurement axes and further alone additional axes that are defined as linear coupling of said X, Y, and Z measurement axes; estimating the coordinate values of a reference point using the distribution of said selected output data and said identified maximum and minimum axial components; and correcting the offset of output data of the acceleration sensor on the basis of the coordinate values of the reference point.
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Specification