JPH0654447B2 - Failure prediction device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a failure prediction device, and in particular, predicts a failure in advance and investigates the cause of the malfunction of the device, and quickly discovers the cause thereof. In addition, the present invention relates to a failure prediction device suitable for performing prior inspection and repair of a place where a failure is likely to occur.

[Conventional technology]

The conventional device performs self-diagnosis of a sensor at the time of repair and inspection of an automobile, which is a controlled device, as disclosed in JP-A-59-16011. Press the key to diagnose the sensor abnormality. However, with this diagnostic device, it is not possible to grasp the sensor abnormality that occurs when the controlled device is in actual operation, and it is not possible to grasp the state that the sensor is becoming abnormal until it completely fails, and the timing of parts inspection is unknown. However, it was not possible to catch the abnormal state that occurs when the vehicle is in actual operation, and no consideration was given to predicting a failure in advance.

[Problems to be solved by the invention]

The above-mentioned conventional technology, when the device in use does not operate normally, the device will stop once, so it is necessary to replace the defective device in order to restore normal operation, No consideration was given to pre-inspection and repair, and there was a problem that downtime of the equipment could be suppressed to a minimum and improvement of the operating rate could not be achieved sufficiently.

An object of the present invention is to provide a failure prediction device capable of suppressing the Daum time of the controlled device and improving the operating rate.

[Means for solving problems]

According to the present invention, as a device (9) for controlling a controlled device (8) including a device that does not operate normally due to deterioration due to operation and progress of consumption, a monitor that generates a monitoring signal according to the operating state of the device is used. Means (7), a reference value storage means (3) for storing a normal reference value indicating that the monitoring signal is normal, and a device for operating the device in an abnormal operation state in which the monitoring signal exceeds the normal reference value. Allowable time storage means (3) for storing an allowable time for allowing the operation, and operation continuation means for continuing the operation of the device when the abnormal operating state of the device returns to the normal operating state within the allowable time (step P11). Control means (1) for executing a path for returning to the step P3 from the Y side of the circuit storage means (4) for accumulatively storing the number of times of return, and when the number of times stored in the circuit storage means exceeds an allowable number. Display means for performing shown (5) and is provided.

[Action]

Even if the equipment is in abnormal operation, if it is a relatively short time, it will not cause serious damage even if it is continuously operated, and if it can return to normal operation in a short time, the above-mentioned monitoring means, reference value storage means, By providing the allowable time storage means and the control means, the operation of the controlled device is not interrupted, so that the operating rate can be improved, and even if such a failure occurs repeatedly, the number of times storage means and display are provided. By providing a means, the number of times that abnormal operation returns to normal operation is cumulatively counted, and this count value is checked and
Since it is displayed when the number of occurrences of failure that requires repairs is approaching, it is possible to know the arrival of the time for inspection and repair of equipment before a serious accident.

〔Example〕

 An embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, the failure prediction device 9 includes a control unit 1, a prediction unit storage unit 2, a reference value storage unit 3, a storage unit 4, and a display unit 5.
And a work input means 6 and a signal processing means 7.

The work input means 6 inputs a work instruction command for instructing start and stop of control for predicting a failure of the controlled device 8 and a detailed data display command for requesting display of the cumulative number of times that the device is not operating normally. For example, a keyboard.

The display means 5 displays a place where a failure of the controlled device 5 is predicted to occur, and displays the cumulative number of times that the abnormal state is detected, and is, for example, a CTR (cathode ray tube display device) or the like. is there.

The storage means 4 stores a location where the failure of the controlled device 8 is predicted by the control means 1, is predicted, a cumulative number of times that the abnormal operation is detected, and an input signal from the controlled device 8. A memory with a battery backup, for example.

The reference value storage means 3 indicates the reference value indicating that the monitoring signal of the controlled device 8 used for the determination of failure prediction is normal, and the time when the signal is not normal but is allowable for the operation of the device. Is stored as a reference value of, for example, ROM (Reed Only Memory).

The predicting means storage means 2 stores a predicting procedure and a predicting logic for predicting a device failure.

The signal processing means 7 inputs to the failure prediction device 9 an analog input signal and a digital input signal taken in as a monitoring signal from the controlled device 8 while the controlled device 8 is operating, and the controlled device 8 is abnormal. The control means 1 determines that the abnormality signal is output to the controlled device 8 as a digital output, and is a signal interface between the controlled device 8 and the failure prediction device 1. For example, an analog input board and a digital input / output board.

The control means 1 follows the procedure of the predictive procedure storing procedure 2 and compares the value input by the signal processing means 7 with the reference value stored in the reference value storing means 3 to perform a predictive control of the failure. do. For example, CPU (Central Processor U
nit).

Next, FIG. 2 shows an operation example using the apparatus of FIG. 1 and an operation example of the apparatus.

First, the power supply to the failure prediction device 9 is turned on, and at P1, the failure prediction signal and its content are input from the work input means 6 to initialize the signal for monitoring. Next, the input for failure prediction is completed, and the control of the failure prediction device 9 is started.
Enter a work instruction command to instruct the start of the prediction function. Next, at P3, the analog input signal and the digital input signal of the controlled device 8 are fetched from the signal processing means 7 and stored as signals to be monitored by the controlled device 8 even if the controlled device 8 is operating. Each is stored in the means 4. Next, in P4, the data stored in the storage means 4 is compared with the data stored in the reference value storage means 3. In P5, if the compared input data is within the standard value as a result of comparison, it is determined that the signal is normal, and the process proceeds to P6. If it is out of the standard value, the signal is not normal, and therefore the process proceeds to P10 to monitor how long the signal continues to be abnormal. At P10, since it is recognized that there is a signal that is no longer normal, it is stored in the storage means 4 as a defective portion. In P11, it is determined whether or not the signal determined to be abnormal continues for the specified time. If it is outside the specified time, the signal is abnormal. Therefore, the abnormal signal is output in P13 as the controlled device 8 To the signal processing means 7. Although the signal monitored in P12 is not normal, but is within the allowable range for operation of the device, the device determines that it is operable, but accumulates an abnormal time,
Count up the monitoring time. In P6, there are cases where a signal showing an abnormal value returns to a normal value within a specified time, and a signal which is originally monitored shows a normal value. In the former case, there is already a problem in P10. Since the location is stored, the process proceeds to P7. In P7, the supervisory signal is
The number of times that the signal was restored within the specified time even though it was once judged to be not normal is counted up as the number of failures of the signal and stored in the storage means 4, and the branch from the previous P1 is performed for re-monitoring of the occurrence of the failure. In the process, the defective portion stored in the storage means 4 is deleted. If the number of failures becomes larger than the specified number of times of the signal, it is recognized that the time of occurrence of failure is approaching, and at P9, the failure prediction device 9 outputs the failure prediction output to the controlled device 8 and the display means 5. A message is displayed to inform the operator that the defective portion of the controlled device 8 is approaching the time when the failure occurs. In this case, the failure prediction device 9
It is also possible to add an alarm device (omitted in the figure) to. Further, while the controlled device 8 is operating, it is possible to use the work input means 6 to display on the display means 5 whether or not there is a failure in the failure prediction signal input in P1 of FIG. 2 and the number of failures. . Therefore, it is possible to grasp the state of the monitored signal before the failure prediction output is output.

As another configuration example, it is possible to connect a printer to the failure prediction device 9 and print the information stored in the storage means 4.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention is capable of knowing a faulty device occurring in a controlled device in an actual operating state and the degree of the fault, and the controlled device fails before it stops due to a failure. Since it is possible to know that the time when the problem occurs is approaching, it is possible to check and repair the defective part in advance in regular inspections such as daily inspections, so that the controlled device does not stop due to a failure and the operating rate There is an effect that can improve.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a failure prediction device according to the present invention, and FIG. 2 is an example diagram of a diagnosis flowchart in FIG. 1 ... Control means, 2 ... Prediction procedure storage means, 3 ... Reference value storage means, 4 ... Storage means, 5 ... Display means, 6 ...
Work input means, 7 ... Signal processing means, 8 ... Controlled device

Claims (1)

[Claims] 1. A device for controlling a controlled device including a device that does not operate normally due to deterioration due to operation and consumption, and a monitoring means for generating a monitoring signal according to an operating state of the device. Reference value storage means for storing a normal reference value indicating that the monitoring signal is normal, and an allowable time for allowing the operation of the device in an abnormal operation state in which the monitoring signal exceeds the normal reference value. Permissible time storage means, operation continuation means for continuing the operation of the equipment when the abnormal operating state of the equipment returns to the normal operating state within the permissible time, and number-of-times storage means for cumulatively storing the number of restorations, A failure prediction device comprising: a display unit that displays when the number of times stored in the number-of-times storage unit exceeds an allowable number.