Title:
BEARING DETECTING SYSTEM
Document Type and Number:
Japanese Patent JPH02264811
Kind Code:
A
Abstract:
PURPOSE:To enable a bearing to be accurately detected during the running of a vehicle by computing sampling times on the basis of a vehicle speed and sampling geomagnetism. CONSTITUTION:A vehicle speed sensor 1 outputs a pulse corresponding to a vehicle speed to be shaped 2. A processor 6 detects the moving speed of a vehicle from a supplied frequency. A bearing sensor 3 decomposes external magnetic field into two orthogonal components Vx and Vy to be inputted to a multiplexer 4. Detection signals thus obtained are supplied to the processor 6 via the multiplexer 4 and an A/D converter 5. The processor 6 detects the proceeding bearing of the vehicle from the detection signals Vx and Vy and feeds the present position information of the vehicle with its moving speed to a display 7 on which the present position of the vehicle is displayed. Thus geomagnetism sampling times are computed on the basis of the vehicle speed obtained from the sensor 1, geomagnetism is sampled and a mean value is obtained. Since the effect of a change in the external magnetic field can be reduced as a result, a vehicle position detection accuracy and a bearing accuracy can be improved.
Inventors:
MATSUOKA YOJI
HIRAYAMA ZENICHI
OUCHI KATSURO
WATANABE KAZUHIRO
HIRAYAMA ZENICHI
OUCHI KATSURO
WATANABE KAZUHIRO
Application Number:
JP8485489A
Publication Date:
October 29, 1990
Filing Date:
April 05, 1989
Export Citation:
Assignee:
HITACHI LTD
HITACHI AUTOMOTIVE ENG
HITACHI AUTOMOTIVE ENG
International Classes:
G09B29/10; G01C21/00; (IPC1-7): G01C21/00; G09B29/10
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)
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