JPS59210317A - Malfunction detector of azimuth detector - Google Patents

Abstract

PURPOSE:To detect malfunction accurately without being affected by temporary disturbance by calculating the absolute value of earth magnetism which, an azimuth sensor detects, on the basis of a prescribed mean value. CONSTITUTION:Detection signals Vx and Vy outputted from an X-axis coil 12 and a Y-axis coil 14 are converted by A/D converters 20 and 22 into digital signals, which are inputted to an arithmetic circuit 24. The absolute value of the earth magnetism that the azimuth sensor detects is calculated and inputted as arithmetic data V to a comparing circuit 26. The comparator 26 compares the input absolute value V with the specific preset reference value GL and operates a driving circuit 28 when the absolute value V of the earth magnetism exceeds the reference value GL to turn on a warning lamp 30 provided to a driver's seat.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a malfunction detection device for an orientation detector, particularly to a malfunction detection device that can automatically detect malfunctions of an H position detector.

Blue area technology Conventionally, it includes an X-axis and Y11 azimuth sensor that detects the geomagnetism by dividing it into two orthogonal components, the X-axis and Y-axis, based on the X-axis and Y-axis detection signals from the azimuth sensor υ. A direction detector that detects the moving direction of a moving object is well known, and is used, for example, in a vehicle navigation system.
It is widely used to detect the direction of travel of a vehicle and for other purposes.

Since this type of bearing detector detects its direction based on the weak geomagnetic field, it is easily influenced by the surroundings. A situation occurs in which the magnetic field of the magnetized lifting platform is disturbed for some reason, making it impossible to accurately detect the traveling direction of the vehicle.

In order to detect the occurrence of such malfunctions, various malfunction detection devices have been put into practical use.

1. However, conventional malfunction detection devices cannot automatically detect the occurrence of malfunction of the 5th position detector. For example, the device must be operated periodically to detect malfunction of the direction detector. Therefore, even if the direction detected by the direction detector becomes incorrect, the old user often uses it without paying attention to it, and the problem is that it does not effectively perform its original function. there were.

In addition, conventional malfunction detection devices do not detect the direction of the vehicle, for example, when the azimuth detector is used in a vehicle navigation system, the direction detector displays the 1i of comparing the direction to be carried out and the true direction
Since IH operation was required, it was not possible to easily detect malfunctions, and the detection accuracy could not be said to be sufficiently reliable.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and the first object is to provide a malfunction detection device that can automatically and accurately detect malfunctions of a direction detector. It's about doing.

In order to achieve the above-mentioned object of the invention, the device of the present invention includes a force position sensor that is installed in a moving body and detects geomagnetism in orthogonal X-axis and Y-axis direction components. A direction detector that detects the moving direction of a moving body based on the X-axis and Y-axis detection signals from the sensor includes an arithmetic circuit that calculates the absolute value of geomagnetism based on the X-axis and Y-axis detection signals, and a a comparison circuit that compares the absolute value with a predetermined reference value, and a feature that automatically outputs a malfunction detection signal of the direction detector when the calculated absolute value of geomagnetism exceeds a predetermined reference 110. shall be.

Example Next, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an example of an azimuth sensor that detects the moving direction of a moving object based on geomagnetism. The excitation coil 16 is wound around the coils so as to be electrically perpendicular to each other, and the excitation coil 16 is roughly wound around the coils. A predetermined alternating current (2) is applied to the excitation coil 16 from an excitation circuit 18, and an alternating magnetic field is generated within the permalloy ring 10.

In general, it is possible to assume that the direction and strength t of the earth's magnetic field are approximately constant, so when the earth's magnetic field 100 interlinks with the illumination sensor, this earth's magnetic field 100 is
2 and the Y-axis coil 14 into two orthogonal directional components (
J is detected, and a terminal voltage corresponding to the moving direction of the moving body is output from the output terminal of each of these coils 12 and 14.

Figure 2 shows the loci drawn by the voltage signals vx and vy output from each coil 12 and 14 on the XY coordinate axes, and the lut traces are located at the origin since the magnitude of the earth's magnetism is approximately constant. It becomes a circular locus with a predetermined radius R centered at .

Therefore, in the case of detecting the running direction of various types of moving objects, such as vehicles, using the azimuth sensor (31, the voltage signals output from each coil 12. By determining the relationship I11, it is possible to detect the vehicle running direction from the 8th marker position of Vy with the voltage signal output from each coil 1 and 2.14. It can be understood.

However, such a direction sensor is
If a moving object, such as a vehicle body, becomes magnetized for some reason, i1! ! The magnetic field is 1 pin for this magnetization ("
Each coil 12.1 is biased as shown in FIG.
The circular locus of the output voltages vx and vy of 4 (well, the center shifts from the origin 0 (0, 0) to 0' (GX, GV) and shifts 1-.As a result, the 0 input without magnetization (The output voltage (a x , aV) that existed at point a in the tiger is
It is biased by the amount of magnetization (Gx, Gv), and a′
The exact azimuth (a') given by (ax + Gx, ay ten Gy)
As a result, it becomes impossible to accurately detect the direction in which the vehicle is traveling.

The characteristic feature of the present invention is that such a malfunction of the direction detector is detected by the detector.
This can be automatically detected by comparing η.

Of course, if there is no influence due to magnetization, the detection signal Vx output from each coil 12.14 of the h position sensor.
, yy are shown in Figure 3. A circular locus of radius R centered at (0,0) is j1^, and the radius R at this time is h, and the absolute value of the geomagnetic field detected by the sensor is Applies to. However, for example, when the vehicle body etc. is magnetized and this magnetization is biased by the earth's magnetism, the detection signals Vx and Vy from each coil 12 and 14 will be centered at O' (GX, Gy) and 1]l F/l trace of radius IR will be drawn. At this time, the magnitude of the geomagnetic field detected by this orientation sensor is the distance #[O
This Qa' is expressed as a', and the distance averaged over one circumference of the track is larger than the value of the radius R.

As described above, in the case 1'''3 when a malfunction occurs in the orientation detector due to a cause such as magnetization, the absolute value of the earth's magnetism detected by the orientation detector becomes larger than the normal value.

Therefore, as shown in Fig. 4, the absolute value of the geomagnetic field detected by the J5 platform direction detector is set by setting the predetermined base Q'' value GL of the person Sana Tsukuda from R to an elliptical locus with radius. By turning around the radius GL of the reference circle shown in FIG. 4, it is possible to detect the malfunction.

For this reason, the malfunction detection device of the present invention uses an arithmetic circuit that calculates the absolute value of the earth's magnetism based on the detection signal of the orientation sensor, and compares the calculated absolute value of the earth's magnetism with a predetermined reference value. A malfunction of the direction detector is detected when the absolute value of the earth's magnetic field exceeds a predetermined reference value.

With the above configuration, according to the malfunction detection device of the present invention, it becomes possible to automatically detect malfunction of the direction detector without performing any special operation.

FIG. 5 shows a preferred embodiment of a malfunction detection device for a vehicle direction detector.
2 and the detection signal Vx output from the Y-axis coil 14,
After converting Vy into digital signals via A/D converters 20 and 22, the signals are manually input to the bee-playing circuit 24.

The arithmetic circuit 24 calculates the detection signals vx, Vy input in this way based on the following equation, calculates the absolute value V of the earth's magnetism detected by the direction i/renri, and calculates the calculated data. V is input to the comparator circuit 26 and -C is input.

The comparator circuit 26 is constructed in such a way that the absolute (ll
'Jv is compared with a predetermined field G1-G1, and when the absolute 1V of the earth's magnetic field exceeds the reference GL, the drive circuit 28 is activated and the Light up the awning lamp 30.

According to the malfunction detection device of the present invention, with the configuration described below, when a malfunction occurs in the direction detector, the A-ning lamp 3o lights up at the same time, making it possible to quickly detect the occurrence of malfunction. Therefore, the driver is required to correct or compensate for the malfunction of the direction detector at the same time as the occurrence of the malfunction.

FIG. 6 is a flowchart illustrating the malfunction detection procedure of the apparatus of this embodiment.

When the ignition switch is turned on and malfunction detection starts, the arithmetic circuit 24 initializes the internal arithmetic data to 11 bits, and then the vehicle speed increases to +15 speeds 7 to 1/l.
When the voltage exceeds Km, the acquisition of detection signals Vx and Vy from the X-axis coil 12 and Y-axis coil 14 is started.

Then, the arithmetic circuit calculates the average value of each of these signals Vx, VV from the 10 consecutively captured detection signals \/×, Vy.
The absolute value V of the earth's magnetism detected by the azimuth lens 1] is calculated based on the average value, and the calculated data is manually input to the comparison circuit 26.

Comparison circuit 26 (the absolute value V of the earth's magnetism input in this way is set to a predetermined reference value, O16 in -9 in the embodiment)
When the absolute value V exceeds the reference value, the driving circuit 28 is activated to turn on the lighting lamp 30.

In this way, the device of the embodiment calculates the absolute value of the geomagnetic field detected by the orientation sensor based on the predetermined average lia, so it can be accurately calculated without being affected by temporary disturbances that occur around the orientation sensor. It becomes possible to detect a malfunction of the direction detector.

FIG. 7 shows the warning lamp 3 used in this embodiment.
0 is shown, and in the embodiment, the warning lamp 30 is installed in the direction detector installed in the driver's seat. When checking the direction, it is possible to recognize malfunction of the direction detector by lighting the warning lamp 30.

Therefore, as shown in FIG. 8, it is understood that malfunctions of the azimuth detector can be detected more quickly than in the case of using a conventional azimuth meter.

J'3, the lighting method of the A-ning lamp 30 is as follows:
Either continuous lighting or point deduction may be used, and the method of indicating malfunctions is not limited to the above-mentioned warning lamps.
For example, if the outer frame of the direction guide shown in Fig. 7 flashes 414
It may also be made of

Although a5 and d3 of the above embodiments show an example in which the motion detection device of the present invention is used as an azimuth detector for detecting the running direction of a vehicle, the device of the present invention is not limited to this. First, it can be applied to an azimuth detector installed in other moving objects.

According to the present invention, it is possible to automatically and accurately detect malfunctions that occur in the direction detector, and as a result, malfunctions that occur in the direction detector can be detected. It will be possible to take a prompt response.

[Brief explanation of drawings]

Figure 1 shows the azimuth range β1 used in the h' position detector.
Figure 2 is a No. 8 characteristic diagram of the direction sensor that always operates in iJE, Figure 3 is a characteristic diagram of direction pin 1 of direction pin 1 in d3 during 3+j operation 11), and Figure 4 is a diagram showing the malfunction of the present invention. FIG. 5 is a block diagram showing one embodiment of the malfunction detection device of the present invention; FIG. 6 is a flowchart of the device based on FIG. 5;
The figure is an explanatory diagram of the azimuth meter used in the device of the embodiment, and FIG. 8 is an explanatory diagram of the azimuth meter of the conventional device. llj samurai old 1■" Sen 2 (outside 1
Figure 1 Y Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] (1) Includes an azimuth sensor installed on the moving object that detects geomagnetism as orthogonal X-axis and Y-axis components, and detects the moving direction of the moving object based on the X-axis and Y-axis detection signals from the positioning sensor. In the direction detector, the X axis and Y 111
11 includes an arithmetic circuit that calculates the absolute value of geomagnetism based on the detection signal, and a comparison circuit that compares the calculated absolute value of geomagnetism with a predetermined reference value. A malfunction detection device for a direction detector, characterized in that it automatically outputs a malfunction detection signal for the direction detector when the number exceeds the number. (2. A malfunction detection device for a direction detector according to claim (1), wherein the malfunction detection signal outputs -C with lighting of a warning lamp.