Boots – shoes – and leggings
Patent
1992-09-01
1994-07-05
Chin, Gary
Boots, shoes, and leggings
364454, 340988, 33356, G06F 1550
Patent
active
053273486
ABSTRACT:
A vehicle-direction detecting apparatus compensates for the direction detected by each sensor to provide a correct direction. A difference signal between the first direction signal based on the XY output signal of a geomagnetic sensor and the second direction signal acquired by integrating the output signal of an angular velocity sensor is computed, it is discriminated whether or not an absolute value signal of the difference signal is greater than a first predetermined value, it is discriminated whether or not the output signal of differentiating means which has differentiated the absolute value signal is greater than a second predetermined value, it is discriminated whether or not the XY output signal of the geomagnetic sensor has a value within a predetermined range, and the first or second direction signal is compensated for in accordance with the results of the above discriminations. Even if the declination or the magnetic center point varies, or the offset of the angular velocity sensor varies, the direction detected by each sensor will be compensated accordingly.
REFERENCES:
patent: 4734863 (1988-03-01), Honey et al.
patent: 4887081 (1989-12-01), Iihoshi et al.
patent: 5040122 (1991-08-01), Neukirchner et al.
patent: 5067083 (1991-11-01), Nakayama et al.
patent: 5115238 (1992-05-01), Shimizu et al.
patent: 5122960 (1992-06-01), Ooka
patent: 5235514 (1993-08-01), Matsuzaki
patent: 5254987 (1993-10-01), Nakatani
English abstract of Okihiko et al Japanese laid open application No. 890049936, Mar. 1989.
English abstract of Seiki Japanese laid open application 840031388, Feb. 2, 1984.
Chin Gary
Pioneer Electronic Corporation
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