JP2785620B2 - Antenna drive system automatic diagnosis device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic diagnostic system for an antenna drive system, and more particularly to an antenna drive system provided with abnormality detection means for monitoring a current flowing through a motor and comparing the current with reference data to detect an abnormality in the drive mechanism. The present invention relates to a system automatic diagnosis device.

[0002]

2. Description of the Related Art In a conventional antenna drive system, it has not been practiced to automatically detect and diagnose an abnormality in a drive mechanism, and an abnormality was discovered only when a complete abnormality phenomenon appeared in the drive system.

[0003]

Therefore, the conventional antenna drive system does not have an automatic diagnosis function, so that even if an abnormality occurs in the drive system, it can be detected as long as it does not fall into a completely abnormal state. In addition to this, there is a problem that it is impossible, and an appropriate action for an abnormal state by early detection cannot be taken, so that damage due to this cannot be minimized. An object of the present invention is to solve such a problem, and an object of the present invention is to provide an automatic antenna drive system diagnosis apparatus that can automatically detect a drive system abnormality and diagnose the abnormality.

[0004]

In order to achieve the above object, an automatic diagnostic system for an antenna drive system according to the present invention comprises a speed command generating means for generating a drive signal for driving an antenna at a constant speed; Angle monitoring means for monitoring the angle of the angle and outputting the angle, interpolation calculation means for interpolating and calculating a normal current value flowing through the antenna drive motor at an antenna angle output from the angle monitoring means based on predetermined reference data, At the time of diagnosis, the current flowing through the motor being driven at a constant speed by the speed command generating means is monitored, and the current value is compared with the normal current value interpolated and calculated by the interpolation calculating means to detect an abnormal current, whereby the drive mechanism is detected. Current abnormality determining means for determining abnormality of the antenna, and a current value indicating the abnormality and an antenna angle in accordance with the determination of the occurrence of abnormality by the determination means. In which and a pay storing means.

[0005]

Therefore, the motor current value flowing during the constant speed driving of the antenna is compared with the normal current value calculated by the interpolation calculating means. If the motor current value is abnormal, the abnormal current value and the antenna angle at which the abnormality has occurred are calculated as follows. Stored in memory sequentially.

[0006]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an antenna drive system automatic diagnosis apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an antenna drive system automatic diagnosis device, and a speed command generation circuit 2,
It comprises an angle monitor circuit 3, a reference data interpolation circuit 4, a current abnormality determination circuit 5, and a memory circuit 6.
Reference numeral 11 denotes an antenna, and the speed command generation circuit 2 outputs a speed command voltage signal for driving the antenna 11 at a constant speed. Reference numeral 9 denotes a driving power amplifying device for amplifying the speed command voltage signal, and reference numeral 10 denotes a motor that rotates by the output of the driving power amplifying device 9 to change the angle of the antenna 11. The angle monitor circuit 3 includes an antenna 11
A resolver signal output from an angle detector resolver 7 for detecting an actual rotation angle of the antenna 11 is received, an angle of the antenna 11 is calculated based on the received signal, and monitoring based on the angle is performed.

Reference numeral 8 denotes an ammeter for measuring a current flowing through the motor 10 when the antenna is driven. Reference data interpolation circuit 4
As a reference data actual measurement operation, the antenna 11 is driven at a constant speed by the speed command generation circuit 2 at an initial stage, that is, at a time when the drive system is normal, and current value data is calculated based on a motor current signal from the ammeter 8. The current value data and the antenna angle data obtained from the angle monitor circuit 3 at that time are stored in the memory circuit 6 as reference data. As a drive system monitoring operation, a normal current value at an antenna angle taken in by performing a constant speed drive similar to the above-described reference data actual measurement operation is subjected to interpolation calculation processing (details will be described later) based on the reference data. . The current abnormality judging circuit 5 detects an abnormal current by comparing the normal current value interpolated by the interpolation processing of the reference data interpolating circuit 4 with the current value taken in at the time of monitoring, thereby causing an abnormality in the drive system. It is to determine whether or not.

Next, the operation of the present invention will be described with reference to FIG. FIG. 2 is a flowchart showing a processing procedure of the automatic antenna drive system diagnosis apparatus of the present invention. First, in step 21, actual measurement of reference data, that is, initial setting is performed.
By transmitting a constant speed command signal from the speed command generating circuit 2 when the antenna drive system is normal, the motor 10
Is driven at a constant speed, a predetermined antenna angle and a current value flowing through the motor 10 at that time are periodically sampled and measured, and the measured value is stored in the memory circuit 6 via the angle monitor circuit 3 and the reference data interpolation circuit 4. Store. In this case the angle data _{θ 1 ', θ 2',} ·· θ n ' and the current value data I
₁ ', I _2', the memory circuit 6 in correspondence · · I _n 'are each
To be stored.

Next, in step 22, similarly to step 21, new angle data and current value data are taken in to diagnose the drive system. This is performed on a regular basis, for example, at a rate of about several times a year. Here, as a preparation for determination on data taken in at the time of diagnosis, a normal current value corresponding to the taken antenna angle is calculated by interpolation based on the reference data stored in the memory circuit 6 in step 21. That is, the reference angle data θ ₁ ′, θ
₂ ′,... Θ _n ′, the reference angle data θ _j−1 ′ that is closest to the newly acquired angle data θ _i at the time of diagnosis such that θ _j−1 ′ <θ _i <θ _j ′. θ _j ′ is extracted, and θ _j−1 ′, θ
'reference current value data I _j-1 corresponding to' _j, I _j to calculate a 'by linear interpolation between the corresponding reference current value data i.e. normal current value I _i to the angle data theta _i at diagnosis'. This interpolation processing is performed to compensate for the current value at the same antenna angle as the reference data accurately at the time of diagnosis, and is therefore performed to compensate for this. Therefore, it is considered that the reference data storage area can be saved.

In step 23, the difference between the current value data taken in at the time of the diagnosis and the normal current value data interpolated and calculated in step 22 is determined by a preset limit value,
For example, an abnormal current in the motor 10 is detected by judging whether or not the value is within a range of an appropriate value at which an abnormality can be found early from a known failure characteristic or the like, and it is determined whether an abnormality has occurred in the drive system. . That the absolute value of the current difference between the current value data I _i and the interpolation calculated normal current value data I _i 'in ipecac's antenna angle theta _i at diagnosis | I _i -
It is determined whether I _i ′ | is smaller than limit value a. As a result, if the current difference is smaller than the limit value, it is determined that no abnormality is found in the drive system, and the process proceeds to step 22 to prepare for the next diagnosis.

On the other hand, when the absolute value | I _i −I _i ′ of the current difference between the current value data Ii at the time of the diagnosis and the normal current value data I _i ′ calculated by interpolation exceeds the limit value a, , The current flowing through the motor 10 indicates an abnormal value, for example, an excessive value or an excessive value, and it is determined that some abnormality has occurred in the drive system, and the process proceeds to step 24, where the current value data I _i indicating the abnormality is obtained. And the angle data θ _i are stored in the memory circuit 6.

FIG. 3 is a graph showing motor current characteristics with respect to the antenna angle. The above-described comparison judgment processing will be described with reference to FIG. In the figure, reference numeral 31 (solid line) indicates normal current data which is initially set as reference data, and reference numeral 32 (dotted line) indicates actual measurement data taken in at the time of diagnosis. If the current value data for the antenna angle θ _i at the time of diagnosis is I _i in step 22, the reference data θ _j−1 ′ and θ _j ′ close to the antenna angle θ _i are extracted, and the corresponding I data is extracted. _j-1 ', I _j' normal current value Ii 'in theta _i from the calculated interpolation. The difference between the normal current value I _i 'and the current value I _i at diagnosis in the following step 23, it is judged whether or not the range of the limit value a. Difference between the current value in the antenna angle θi in the figure determines that abnormal current flows because it exceeds the limit value a, the measured data theta _i and I _i are stored in the memory circuit 6 at step 24.

Therefore, by repeatedly performing such a diagnostic process, the antenna angle at which an abnormality has occurred and the motor current value at that time are stored in the memory circuit 6 as a result of the diagnostic process. By doing so, an abnormality occurring in the antenna drive system can be detected. In the embodiment, the abnormality is detected by referring to the data at the time of occurrence of the abnormality stored in the memory. However, a notifying unit is provided to automatically notify the administrator of the occurrence of the abnormality before and after the abnormal data storage process. May be notified. Further, for the purpose of ensuring the safety of the drive system, a stop control means may be provided to stop the operation of the drive system when an abnormality occurs. In the embodiment, the reference data is taken as the initial setting by actually measuring the reference data by the reference data interpolation circuit 4. However, a means for setting reference data may be newly provided, or data specific to the drive system may be measured. If it is not necessary, step 21 may be omitted and predetermined reference data may be stored in the memory circuit 6 in advance.

[0014]

As described above, according to the present invention, means for measuring the motor current value corresponding to the antenna angle during the constant speed driving of the antenna is provided. The current value taken in the same way at the time of diagnosis is compared with the normal current value calculated by interpolating the reference data to detect the presence / absence of an abnormal current. Since the data indicating the abnormality as the diagnosis result is automatically and sequentially stored in the memory, it is possible to detect the abnormality occurring in the antenna driving system by analyzing the data. Therefore, in the antenna drive system, it is possible to detect the drive system failure early based on the antenna angle at the time of occurrence of the abnormality stored in the memory and the abnormal current value flowing to the motor, and to perform an accurate diagnosis, thereby minimizing damage due to this. This has a special effect that it is possible to perform only appropriate measures.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of the present invention.

FIG. 3 is a graph showing a motor current characteristic with respect to an antenna angle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna drive system automatic diagnosis apparatus 2 Speed command generation circuit 3 Angle monitor circuit 4 Reference data interpolation circuit 5 Current abnormality judgment circuit 6 Memory circuit 7 Resolver 8 Ammeter 9 Driving power amplifier 10 Motor 11 Antenna

Claims (1)

(57) [Claims] A speed command generating means for generating a drive signal for driving the antenna at a constant speed; an angle monitoring means for monitoring an angle of the antenna and outputting the angle; and an antenna output from the angle monitoring means. Interpolation calculating means for interpolating and calculating a normal current value flowing through the antenna driving motor at an angle based on predetermined reference data, and monitoring the current flowing through the motor during constant speed driving by the speed command generating means at the time of diagnosis. Current abnormality determining means for determining an abnormality in the drive mechanism by detecting an abnormal current by comparing the normal current value interpolated and calculated by the interpolation calculating means with an abnormal current; Storage means for storing the current value and the antenna angle indicating the following.