JPH01104513U

JPH01104513U -

Info

Publication number: JPH01104513U
Application number: JP20149887U
Authority: JP
Priority date: 1987-12-29
Filing date: 1987-12-29
Publication date: 1989-07-14
Anticipated expiration: 2002-12-29
Also published as: JPH0623928Y2

Description

[Brief explanation of the drawing]

第１図はクレーム対応図、第２図は本考案が適
用されたナビゲーシヨンシステムを示すブロツク
図、第３図は地磁気方位センサーの構成説明図、
第４図は地磁気方位センサーの励磁特性説明図、
第５図は無磁界中における地磁気センサーのパー
マロイコアでの磁束変化を示す特性図、第６図は
地磁気方位センサーの検出作用説明図、第７図は
地磁気方位センサーの検出電圧特性図、第８図は
車両走行方位の説明図、第９図は出力円説明図、
第１０図は地磁気方位センサーに地磁気以外の磁
界が加わつた状態を示す説明図、第１１図は車体
着磁による出力円の移動を示す説明図、第１２図
は本考案の一実施例における処理手順を示すフロ
ーチヤート、第１３図、第１４図および第１５図
は変化開始点、ピーク点および戻り点の磁化強度
説明図である。１…地磁気方位センサー、２…表示部、３…Ｃ
ＰＵ、４…ＲＯＭ、５…ＲＡＭ、７…パーマロイ
コア、８ｘ，８ｙ…巻線、１０…巻線（励磁用）
、２０…警報装置。 Fig. 1 is a complaint response diagram, Fig. 2 is a block diagram showing a navigation system to which the present invention is applied, Fig. 3 is an explanatory diagram of the configuration of a geomagnetic direction sensor,
Figure 4 is an explanatory diagram of the excitation characteristics of the geomagnetic direction sensor.
Fig. 5 is a characteristic diagram showing magnetic flux changes in the permalloy core of the geomagnetic sensor in the absence of a magnetic field, Fig. 6 is an explanatory diagram of the detection operation of the geomagnetic azimuth sensor, Fig. 7 is a detection voltage characteristic diagram of the geomagnetic azimuth sensor, and Fig. 8 The figure is an explanatory diagram of the vehicle running direction, Figure 9 is an explanatory diagram of the output circle,
Fig. 10 is an explanatory diagram showing a state in which a magnetic field other than geomagnetism is applied to the geomagnetic direction sensor, Fig. 11 is an explanatory diagram showing the movement of the output circle due to vehicle body magnetization, and Fig. 12 is a process in an embodiment of the present invention. A flowchart showing the procedure, FIGS. 13, 14, and 15 are explanatory diagrams of magnetization intensity at a change start point, a peak point, and a return point. 1...Geomagnetic direction sensor, 2...Display section, 3...C
PU, 4...ROM, 5...RAM, 7...permalloy core, 8x, 8y...winding, 10...winding (for excitation)
, 20...Alarm device.

Claims

[Scope of Claim for Utility Model Registration] Coordinate position change detection means for detecting a sudden change in the coordinate position output of a geomagnetic sensor; a coordinate position magnetization strength detection means for detecting each coordinate position and magnetization strength of the return point; a distance determination means for determining whether the coordinate distance between the change start point and the return point is separated by a predetermined value or more; and the peak a magnetization strength determination means for determining whether the magnetization strength at the point and the return point is close to the magnetization strength at the change start point; and an alarm output generating means for generating an alarm output when each condition is satisfied in both of the above determination means. A vehicle compass comprising: means;