Direction detecting system for vehicles
First Claim
1. A direction detecting system including:
- direction detecting means mounted on a moving body for detecting a direction of two components of earth magnetism in order to produce two detection signals corresponding to said two components; and
computing means for computing a direction of the moving body in response to the detection signals from said direction detecting means to produce a direction signal, said computing means comprising;
(a) first means responsive to the detection signals from said direction detecting means in accordance with a rotation of said moving body, for computing a distortion amount indicative of an offset value by which the vectorial locus of a circle which said detection signals define is displaced from a true circle centering at an origin, and for storing said distortion amount; and
(b) second means for correcting the detection signals from said direction detecting means in accordance with said distortion amount stored by said first means to produce a corrected direction signal.
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Accused Products
Abstract
A direction detecting system comprises a geomagnetic field sensor for detecting the direction of the earth magnetism by two perpendicular components and a computing circuit for computing a direction and producing a direction signal from the electrical signals associated with the two perpendicular components from the geomagnetic field sensor. The computing circuit detects maximum values of distortions according to the distortion characteristics of the electrical signals associated with the two perpendicular components from the geomagnetic field sensor. Distortion amounts are computed and stored by the maximum distortion values and are used to correct the electrical signals from the geomagnetic field sensor.
93 Citations
11 Claims
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1. A direction detecting system including:
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direction detecting means mounted on a moving body for detecting a direction of two components of earth magnetism in order to produce two detection signals corresponding to said two components; and computing means for computing a direction of the moving body in response to the detection signals from said direction detecting means to produce a direction signal, said computing means comprising; (a) first means responsive to the detection signals from said direction detecting means in accordance with a rotation of said moving body, for computing a distortion amount indicative of an offset value by which the vectorial locus of a circle which said detection signals define is displaced from a true circle centering at an origin, and for storing said distortion amount; and (b) second means for correcting the detection signals from said direction detecting means in accordance with said distortion amount stored by said first means to produce a corrected direction signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A direction detecting system including direction detecting means mounted on a moving body for detecting a direction of earth magnetism by detecting two components thereof perpendicular to each other so as to produce a detection signal and computing means for computing a direction of the moving body to generate a direction signal in response to the detection signal associated with said two components and produced by said direction detecting means, said system comprising:
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means for generating a timing signal; means for storing the detection signal from said direction detecting means when said means for generating generates said timing signal; means for discriminating whether a detection signal from said direction detecting means is identical with the detection signal stored by said means for storing; means, sequentially responsive to the detection signal from said direction detecting means, for computing a maximum value and a minimum value of said detection signal from the time when said means for generating generates the timing signal until the time when said means for discriminating decides that the detection signal of said direction detecting means is identical with that stored by said means for storing; means for dividing a sum of the maximum value and the minimum value of the detection signal by 2 to provide an offset value when said means for discriminating decides that the detection signal of said direction detected means is identical with that stored by said means for storing; and means for correcting the detection signal from said direction detecting means in accordance with the offset value of the detection signal provided by said means for dividing.
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Specification