JP2643888B2 - Buffer link unit for data recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buffer link unit for a data recorder, and more particularly to data for efficiently recording sudden or irregular phenomena among measurement data recorded in the data recorder. It relates to the buffer link unit for recorder.

[0002]

2. Description of the Related Art Data recorders are required to have operation records of factory plants and production lines, navigation records of equipment requiring safety and high reliability such as aircraft, and efficient maintenance such as trains and automobiles. This is used to record the operation of a device to be operated, and to analyze the data recorded in the data recorder to determine the cause of the abnormality when an abnormality occurs in the operation state.

As a conventional measuring method using a data recorder, the following two methods have been adopted as a method of measuring and recording a sudden phenomenon based on an abnormal operation state. One is to record the operation status at all times, regardless of the occurrence of the phenomenon, and search for necessary (abnormal) data from it. The other is from the time when the occurrence of the phenomenon is detected This is a method in which the data recorder is started up quickly and only the portion where the phenomenon has occurred is recorded.

[0004]

However, in the above-described recording method, when it is desired to accurately measure a sudden phenomenon or to measure only when an abnormal signal occurs in a continuous event, the following method is used. There was a problem as shown.

(1) In the method of constantly recording the operation state, the data recorder must be operated endlessly, and since the number of tapes to be recorded is limited, usually a plurality of data recorders are prepared and alternately provided. It will be operated. In addition, the data recorded on the tape of the recorder becomes enormous in proportion to the operation time of the equipment. There is a need to. Furthermore, there is a method of recording an event signal simultaneously with a data signal only when an abnormal signal is obtained from recorded data so that an abnormal portion can be identified. Must deal with a great deal of recorded data.

(2) In the method of starting and recording a data recorder from the time when the occurrence of a phenomenon is detected, only necessary data is recorded in the recorder, so that data analysis can be easily performed. Since it takes a certain amount of time to start up the data recorder, the phenomena that can be recorded are limited to those that are slower than the time it takes to start up the data recorder. There was a problem that it was done. Also,
Even when the phenomenon is not clear or when a similar signal is constantly generated, the timing of starting up the data recorder cannot be obtained, and the recording may be dropped.

(3) Further, there is a device provided with a data buffer for writing data while monitoring the remaining data amount that can be recorded on the recorder (Japanese Patent Laid-Open No. 3-17132).
No. 2), the input data is all recorded on the recorder, as in the above-described example, so that it is extremely difficult to search for necessary data.

SUMMARY OF THE INVENTION The present invention has been made to solve these problems in the related art, and records only data relating to a phenomenon to be recorded in a data recorder so that data analysis can be easily performed. It is an object of the present invention to provide a buffer link unit for a data recorder that can record necessary data in a complete form without depending on the start-up time of the recorder or the type of a phenomenon to be recorded.

[0009]

In order to achieve the above object, the present invention provides a method of writing a signal to be measured in a loop system.
Loop buffer to read and predetermined judgment
A determination unit for determining whether a signal to be recorded in the data recorder exists in the signal to be measured based on a sudden change in logic or a signal , and a signal to be recorded in the data recorder by the determination unit in the signal to be measured. When it is determined that the data exists, the control unit records the predetermined data in the loop buffer in the data recorder.

[0010] The present invention includes an A / D converter for converting an analog signal to be measured into a digital signal, Lou to write the digital signal from the A / D converter to the loop
And flop buffers, determination logic or predetermined
It is determined whether or not the digital signal from the A / D converter has a characteristic to be recorded based on a sudden change of the signal. If the digital signal has the characteristic, the digital signal among the signals written in the loop buffer is determined. A determination unit that outputs a signal related to the characteristic, a drive control unit that drives and controls the data recorder according to the output signal of the determination unit, and converts the signal output from the loop buffer into an analog signal by the determination unit. And a D / A converter for outputting the data to a data recorder.

Here, the determination unit may be configured to apply information related to the determination, for example, a label, a code, a time, and a data amount to the signal output from the buffer. Search efficiency is further improved.

[0012]

The data recorder buffer link unit of the present invention having the above-described structure converts a measured signal into a digital signal, temporarily stores the digital signal in a loop-shaped buffer, and records the phenomenon in the measured signal. It is determined whether or not an error has occurred, and whether or not to record the data in the data recorder is determined. Then, when there is a phenomenon to be recorded in the measured signal, the data recorder is driven, a necessary signal in the buffer is taken out, converted into an analog signal,
Record on the data recorder. If there is no phenomenon to be recorded in the measured signal, without driving the data recorder,
That is, the determination of the input measurement signal is repeated without performing recording on the data recorder.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a measurement signal input unit;
The level of the analog signal input here is adjusted as appropriate, and output to the A / D converter 2. The analog signal output to the A / D converter 2 is converted into a digital signal here.

The loop buffer 3 is a buffer capable of writing and reading an input signal in a loop manner.
Signals digitized by the A / D converter 2 are input and sequentially stored.

The judging unit 4 judges whether the digital signal from the A / D converter 2 includes a signal to be recorded (for example, an irregular or discontinuous signal caused by a sudden event). If there is such a signal, the drive control unit 6
And outputs a predetermined signal to the loop buffer 3 and controls them. That is, a drive signal of the data recorder 7 is output to the drive control unit 6, and a signal for causing the D / A conversion unit 5 to output specific data in the buffer is output to the loop buffer 3.

The determination unit 4 determines the presence of a signal to be recorded by a method using a predetermined determination logic and a determination based on a sudden change in the input signal. Although a method may be considered, any one of the above methods may be used in the present invention, or both may be used in combination.

In the former determination method, specifically, an input signal level is compared with a set and stored signal level, and a determination is made based on whether or not the input signal level is within an allowable value. Further, it is also possible to adopt a method of determining whether or not the signal is a signal to be recorded based on a result of combining a plurality of input signal levels, and as waveform data,
A method may be employed in which a pattern of a change in a time-series input signal is compared with a stored pattern to make a determination.

The latter determination method detects that the amount of change in a signal during a certain period is greater than the amount of change before and after that, ranks the level of the magnitude, and selects a signal with a higher rank. Thus, a signal to be recorded is determined.

When the judging section 4 judges that the signal to be recorded in the data recorder 7 is in the buffer 3 as a result of the above judgment, the judging section 4 sets the data read pointer to the corresponding address on the loop buffer 3. The signal is moved, and the subsequent signals are output to the D / A converter 5.

The digital signal output to the D / A converter 5 is converted to an analog signal for recording on a data recorder. The determination unit 4 monitors the digital signal input to the D / A conversion unit 5, detects the position of the recorded pointer, and drives the drive control unit based on a preset condition based on the pointer. 6 outputs a stop signal of the data recorder 7.

The drive control unit 6 controls the drive of the data recorder 7 based on the output signal from the determination unit 4. That is, the drive control section 6 is connected to the drive section of the data recorder 7, and upon receiving a drive signal from the determination section 4, turns on the power supply of the drive section and drives the data recorder 7 to enable data recording. When a stop signal is received from the determination unit 4, the power of the drive unit is turned off and the data recorder 7 is stopped.

Next, the operation of the data recorder buffer link unit of the present invention will be described with reference to an embodiment. The present invention, for example, when recording the flight status of the aircraft, measuring information during flight such as instrument information and operation information in the cockpit, engine operation information, aircraft vibration information, and the like, the measured data Among them, a signal considered to be abnormal is efficiently recorded in a data recorder.

These measured signals are input to the input unit 1, the input signal level is adjusted, and then transferred to the A / D conversion unit 2. The analog signal input to the A / D converter 2 is converted into a digital signal so that it can be written to the loop buffer, and is transferred to the loop buffer 3. At the same time, the signal is also transferred to the determination unit 4 to determine whether the signal is a signal to be recorded.

When the input signal, that is, the signal in the loop buffer 3 is determined to be a signal to be recorded, a data recorder drive signal is sent from the determination section 4 to the drive control section 6 and the data Check that the recorder 7 has been operated reliably.

The determination section 4 moves a data read pointer to an address on the loop buffer 3 where a signal required for recording is written, and outputs this signal to the D / A conversion section 5. The D / A converter 5 converts a digital signal into an analog signal and outputs the analog signal to the data recorder 7. The signal input to the data recorder 7 starts to be recorded on the tape.

Next, when the input signal changes to a state in which recording is not necessary, the determination unit 4 makes a determination, and when it is confirmed that the data in the loop buffer 3 is only unnecessary data. Then, a command is sent to the drive control unit 6,
The data recorder 7 is stopped.

FIG. 2 is a conceptual diagram illustrating the temporal relationship between data input to the buffer link unit for a data recorder of the present invention and output from the loop buffer. Assume that input data A, B, E, G, H...
Of the input signal, and the signal E among the input signals is an abnormal signal to be recorded. Input data is A
It is determined whether or not the signal is an abnormal signal after being subjected to / D conversion. The signal E includes a time a for A / D conversion, a determination time b by the determination unit 4 (a pointer is added to E within this time), The data is output to the data recorder 7 through a data recorder activation time c by the drive control unit 6, a determination information recording time d by the determination unit 4, and a D / A conversion time e. The data recorder 7 performs data recording for a data recording time f in accordance with a predetermined condition, in this example, a condition of recording up to four signals after the pointer.

As described above, the present invention has been described in detail with reference to preferred embodiments. However, the present invention is not necessarily limited to the above embodiments, and various modifications and aspects can be made within the scope of the claims. .

[0029]

As described above, the present invention has the following effects. (1) When it is necessary to always record irregular or sudden phenomena reliably, such as when measuring a system that requires safety and high reliability, data is generally used. Data is acquired by the recorder,
According to the present invention, only necessary signals can be recorded, so that data can be collected without using a large amount of tape. In addition, since no extra data is recorded, necessary data can be reproduced in a short time.

(2) Even when it is necessary to detect a peculiar signal from continuous signals, a large number of parameters can be set for determination, so that only the peculiar signal part can be recorded. This makes it possible to use the data recorder efficiently.

(3) Unlike the case where the data is recorded after an abnormal phenomenon occurs, the data at the rising part of the phenomenon or the data before that can be completely recorded, and the transient state change can be prevented. Follow-up becomes easy, and the cause of the abnormal phenomenon can be easily estimated.

(4) Since the data of the time required for the judgment is maintained by the buffer, it can correspond to a complicated judgment logic.

[Brief description of the drawings]

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

FIG. 2 is a conceptual diagram illustrating a temporal relationship between data input to a data recorder buffer link unit and an output from a loop buffer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input part 2 A / D conversion part 3 Loop buffer 4 Judgment part 5 D / A conversion part 6 Drive control part 7 Data recorder

Claims (5)

(57) [Claims] 1. A signal to be measured is written in a loop and
The loop buffer to be read and a predetermined decision logic or sudden change in signal
A determination unit that determines whether there is a signal to be recorded in the data recorder in the signal to be measured based on the conversion , and the determination unit determines that the signal to be recorded in the data recorder is present in the signal to be measured. in the case, the above-mentioned Lou
Data recorder buffer link unit, characterized in that it comprises a control unit for recording predetermined data in the flop buffer data recorder. Wherein the A / D converter for converting an analog signal into a digital signal to be measured, a loop buffer for writing the digital signal from the A / D converter to the loop, a predetermined determination logic or signal Sudden change of
It is determined whether or not the digital signal from the A / D converter has a characteristic to be recorded based on the conversion. If the digital signal has the characteristic, the signal related to the characteristic among the signals written in the loop buffer is determined. A determination unit that outputs a signal; a drive control unit that drives and controls the data recorder in accordance with an output signal of the determination unit; a signal output from the loop buffer by the determination unit to an analog signal; A buffer link unit for a data recorder, comprising a D / A converter for outputting. 3. The buffer link unit for a data recorder according to claim 1, wherein the determination unit applies information regarding the determination to a signal output from the buffer. 4. The predetermined determination logic compares an input signal level with a set signal level, and determines whether an input signal is within an allowable value. A buffer link unit for a data recorder according to 1, 2, or 3. 5. The determination logic according to claim 1, wherein the predetermined determination logic performs the determination by comparing the input signal level with a pattern that stores a time-series change pattern of an input signal as waveform data. Item 4. A data recorder buffer link unit according to item 1, 2 or 3.