JPS60165510A - Goniometer - Google Patents

Abstract

PURPOSE:To recognize the moving direction of a vehicle, etc., immediately by sectioning an azimuth into 12, and displaying them electronically with two alphabetic characters. CONSTITUTION:Alternating voltages developed across two detection winding with the alternating magnetic flux in a magnetic core which synchronizes with an alternating pulse current applied through an exciting winding are detected while those windings are rotated; and their output potentials Vx and Vy are compared with four stages of comparative potentials v1, v2, v3, and v4. Then, x1 is defined as 1 or 0 according to whether the potential Vx is higher or lower than v1, x2-x4 are defined for v2-v4 to determine (x1-x4) similarly, and y1- y4 are also defined for the potential Vy as well. Further, signals (x1-x4) are handled in binary notation to define Sx=2<3>x1+2<2>x2+2<1>x3+2<0>x4, and converted to a binary notation, and Sy is defined and combined similarly, thus sectioning the azimuth into 12 with (Sx, Sy).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compass for detecting the direction of a magnetic field, particularly the earth's magnetic field, and for displaying the direction of travel of a vehicle or the like.

In recent years, the automobile industry has put into practical use systems in which information such as the speed and direction of a vehicle is processed by a computer and displayed inside the vehicle. Along with the practical use of such systems, compass indicators that display only the direction in which a vehicle is traveling have been in the spotlight, and display methods are also being studied.

Conventionally, magnetic type direction meters were generally used for this type of direction, but due to the lack of detection accuracy and the difficulty of electronic display, direction sensors that enable electronic detection have been developed. demand is increasing, and their development is progressing in various fields.

Against this backdrop, T wo -A xis F
1ux-oate Maanetieter (j E
EE, TRANSAC-TIONS ON GEO8
IENCEELECTRONIC8vol, GE-7,
No. 4 Oct. 1960) has been put into practical use. That is, an excitation winding is wound around a ring-shaped or rectangular magnetic core of ferromagnetic material, and two windings are used as output windings so as to surround mutually opposing portions along the orthogonal X and Y axes. The winding is used as a direction sensor. FIG. 1 shows an example of this state.

Here, let us briefly describe the operation for detecting the direction. In the orientation detection head as shown in FIG. 1, a pulsed alternating current of several kHz is applied through an excitation winding 1 to excite an alternating magnetic flux in a magnetic core 2 in synchronization with the pulsed current. At this time, two sets of detection windings 3a and 3b
An alternating voltage synchronized with the pulse current is generated. Now, considering the detection winding 3a, the magnetic flux Φi passing through the A side and the B side shows opposite directions, so when considering the entire detection winding 3a, the magnetic flux Φi cancels each other out, and the output is zero. It is.

However, the geomagnetic component 1 perpendicular to the detection winding 3a
If Oa exists, the magnetic flux passing through the A side and the B side becomes unbalanced, and an output corresponding to Hoa can be detected.

The output corresponding to 1-job can be detected in the same manner for the other detection winding 3b. FIG. 2 shows the pulse current waveform and the output waveform when receiving the geomagnetic component.

Therefore, by converting and amplifying this output (alternating voltage) to a DC voltage and rotating the orientation detection head 360 degrees, a relationship between the orientation and the output voltage (DC voltage) as shown in FIG. 3 is obtained.

The present invention is one of the methods for electronically displaying a direction meter.
It is characterized by dividing it into two parts and displaying it in two full-coated characters.

Next, a specific method for dividing the orientation into 12 sections based on these relationships will be described. FIG. 4 shows four levels of comparison potentials (vl) based on the relationship between the orientation and the output potentials (VX, Vy) shown in FIG.

■2+ v3. Vl) is provided. Here, if the direction is north, the potential of the output VX is V
x<v,,Vx<V2. VX> Va, VX> V
It is l.

Now, when VX<V, x, = 0, when Vx > Vl, x, = 1 is established via a comparator, and in the same way, x2. ×3. If we define ×4, in this case, (XI, X2 + Xa + X4) becomes (
ooii). Furthermore, these four signals (XI, ×2.X3+Xa) are handled in binary notation, and Sx= 2'X, + 22
×4 and convert it to decimal, in this case (oo
ii>, so 5x=2" X O+ 2' X
O+ 2' x 1+ 2° x 1-3.

Now, we are thinking of dividing the direction into 12 sections, so if we compare it to the dial of a clock, north is 12 o'clock, east is 3 o'clock, south is 6 o'clock, and west is 9 o'clock. If you express it,
(XI + X2 + ×3 of each 12 directions (each time)
+×4> and sx can be summarized as shown in FIG. At this stage, the 12 o'clock direction, 6 o'clock direction, 1
The direction of the hour and the direction of 5 o'clock are the same direction, and then 2 o'clock.

The 3 o'clock and 4 o'clock azimuth groups and the 8 o'clock, 9 o'clock, and 10 o'clock azimuth groups both exist as the same clear day.

Next, for the other output Vy, convert it to v2 and v
Compare with 3. In the north direction (12 o'clock direction), VV <
v2. Since VV<Va, it is understood that V2=O and V3=0 in exactly the same way as above. Furthermore, in the east direction (3 o'clock direction), VV <
V2, VV > V3 (In the case of D, V2 = 0. y3 = 1. Here, in order to handle it in the same way as in the case of VX, provisional signals V' and V'' are provided. two signals (V2. Va, V'.

y''), sy = 2' V2 + 22Vs
12'y' + 2 y'') is defined, and the above Sx
can be expressed in exactly the same way. For the sake of simplicity, we will treat it as V' = V'' = O,
In the north direction (12 o'clock direction), it is (oooo>), and in the east direction (3 o'clock direction), it is (0100).

Therefore, Sy is Sy (north) = O, Sy (east) = 4
becomes. Regarding Vy, each of the 12 directions (y2°Va, V'
, V") and SV can be summarized as shown in FIG.

From the above results, the relationship between each of the 12 directions and (Sx, Sy) can be summarized as shown in FIG. As is clear from FIG. 5, each of the 12 directions is (sx.

By using the array Sy), it becomes possible to display without duplication.

FIGS. 6 and 7 show an example of a logic circuit for carrying out the above-described operation. That is, as explained in FIG. 4, FIG. 6 shows a comparison potential v, with the outputs Vx and Vy provided in advance.

xI r X2 in contrast to v2rVa and v4.

×3 * 4-bit signal consisting of X4 and V2.

This is a circuit for setting each of the 4-bit signals consisting of Va+V' and V''. Also, Figure 7 shows the circuit for handling the previously obtained 4-bit signal in binary notation and converting it to decimal notation. Decoder and (Sx, Sy) shown in Figure 5
A theoretical circuit for dividing the orientation into 12 categories is shown based on the combinations of .

Here, 12 divisions are realized through an AND circuit (logical product). -To give an example, the current direction is north (12
If it is the direction of the hour), then from Figure 5 (SX, SV)
= (3,0), so in decoder (1) Sx
The terminal No. 3 will output, and the terminal SvO will output from the decoder <2).

At this time, only the element 1, which is the connection point between the two, ie, the top stage in the AND circuit of FIG. 7, operates and transmits the output to the terminals 12 of the 12 azimuth sections.

Thereafter, each direction is determined in the same manner (SX).

Sy) is output to a predetermined number terminal via an AND circuit, thereby realizing 12 divisions of orientation.

Here, an example for displaying the direction using two alphabetic characters will be presented, and further explanation will be added.

A board was prepared by processing a black acrylic plate into a disk shape and further making 12 small holes so that the centers overlapped on concentric circles. A display board is created by stacking stickers depicting two letters of the alphabet in appropriate positions on the soil in the small hole, and light-emitting diodes are installed under the hole.

FIG. 8 shows this situation.

Therefore, if the final output terminal shown in Fig. 7 is connected to each predetermined light emitting diode, the information sent out from the direction detection head will operate the predetermined light emitting diode via the processing circuit, and as a result, the The letters on the sticker placed above will appear and cover the direction.

Further, FIG. 9 shows another embodiment of the present invention,
A specific example is shown in which orientation is displayed by forming a diode matrix in a display processing circuit using two 7-segments.

First, in FIG. 9(b), each terminal ■ to ○ in the two left and right seven segments are independently combined, and the display pattern rl
A transistor switching circuit is provided as shown in FIG. 9(C) so that E5LI is formed. here,
Since we are dealing with two 7 segments on the left and right, the base terminals of each transistor are "l+e, lsI'+...
...ul. Next, in order to display each direction by combining two characters as shown in Figure 9, each base terminal is appropriately combined and a transistor switching circuit is set as shown in Figure 9(a). do. Here, the reason for forming a diode matrix as shown in FIG. 3C is to allow each base terminal to operate independently.

The final output terminal 1a of the 12 transistor switching circuits set in this way is shown in FIG.
If this continues, the information being sent out from the direction detection head will operate a predetermined switching circuit via the processing circuit described above, resulting in the formation of two appropriate characters', thereby displaying the direction. can.

For example, when displaying the display pattern Roro corresponding to the north direction in FIG. 5, that is, the 12 o'clock direction, a signal is input to the direction classification terminal 12 in FIG. 7, that is, the terminal 12 in FIG. 9(a). , the signal is transmitted to the base terminal nIn n2 in FIG. 9(C), and the left segment terminals ■, ■, ■, ■, ■ in FIG. 9(b) and the cloth segment terminals ■, ■, 0 in the same figure. , 0.0 will operate at the same time and the pattern Roro will be displayed.

The present invention provides a direction meter characterized by using alphabetic characters in order to instantly recognize the direction of travel of a vehicle, etc., and is expected to be put to practical use in various fields in the future. It is something.

Moreover, although the feature here is that the directions are divided into 12 divisions, it goes without saying that a similar display method in which the directions are divided into 8 or 16 divisions can also be implemented.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration explanatory diagram showing an example of the direction detection head in the direction meter according to the present invention, FIG. 2 is a diagram showing the input current waveform and output detection waveform to the direction detection head shown in FIG. 1,
Figure 3 shows the output is converted to DC and amplified, and the direction detection head is
FIG. 4 is a diagram showing a specific example of how the direction is divided into 12 divisions in the present invention, and FIG. Figure 6 is a diagram showing the relationship, Figure 6 is a circuit diagram for preprocessing in an electronic circuit for dividing directions into 12, and Figure 7 is a diagram showing an example of a logic circuit in an electronic circuit for dividing directions into 12. , FIG. 8 is a diagram showing a specific embodiment for dividing azimuth into 12 parts and displaying them with two characters based on the present invention.
The figure shows a specific embodiment for dividing the orientation into 12 sections and displaying them using two 7 segments based on the present invention. Figure 1 β Figure 2 Figure 5, 6 Figure 77 Figure 6 q Figure (a) (b)

Claims (1)

[Claims] 1. As one of the electronic display methods of the compass,
A compass that is characterized by dividing and displaying the division by two alphabetical characters. 2. An azimuth meter according to claim 1, characterized in that the azimuth is displayed by using two 7-segment segments 1- and forming a diode matrix 1- in the display processing circuit.