JPH0822151B2 - Failure information monitoring method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a failure information monitoring method used for failure diagnosis of an electric motor control device.

[Conventional technology]

FIG. 3 is a block diagram showing a configuration of a motor control device by a conventional microcomputer system shown in, for example, page 40 of May 58 issue of the Institute of Electrical Engineers of Japan, in which 1 is a control power supply and 2 is a control power supply. Microcomputer system, 3 is a power converter such as a rectifier or inverter controlled by the microcomputer system 2, 4 is an electric motor, 5 is the power converter 3 and electric motor 4.
, A signal input device for detecting the various quantities and converting them into a digital value and taking them in, or for making a failure judgment by comparing with a certain reference level, 6 is a failure display device such as an LED, 7
Is a failure reset switch, and 10 is a control power supply input voltage.

Next, the operation will be described. First, the control of the electric motor is
The driving power is transmitted to the electric motor 4 via the power converter 3 by a program stored in the ROM of the microcomputer system 2. During feedback control such as speed control, a feedback signal such as the motor speed is input to the microcomputer system 2 via the signal input device 5 and matched with a preset command value in software for speed control. When the microcomputer system 2 receives the operating power from the control power supply 1, the CPU, ROM,
RAM, I / O ports, etc. operate centered on the CPU by programs stored in ROM. Here, for example, the program stored in the ROM is for performing the DC word Leonard control, and operates according to the flowchart shown in FIG. That is, when the control power supply is turned on or the CPU is reset in ST-1, the memory (RAM or the like), the I / O port and the like are initialized in ST-2. In ST-3, control constants are calculated, and in ST-4, peripheral ICs are initialized. Continued ST-5
Then, after the loader access process is performed, the start / stop sequence process is executed in ST-6. Further, FIG. 6B is a flow chart when there is one interrupt process as an example of the word Leonard control by the interrupt process or the like. That is, there are various levels of interrupt processing, and how a program is constructed depends on the system construction. Next, when a failure occurs in the motor, the microcomputer system 2 automatically determines the details of the failure,
After performing a failure process such as stopping the output of the power converter 3, the details of the failure are output to the outside via the failure indicator 6 or the like. In addition, the signal waveforms before and after the occurrence of a failure are stored in the RAM, which is a component of the microcomputer system 2, and the output of waveform reproduction (hereinafter abbreviated as trace data) etc. is provided in the microcomputer system 2. It is output from the A output port to the outside and used for diagnosis of the cause of failure. After failure recovery, failure reset erases all failure information and enables normal operation.

[Problems to be solved by the invention]

Since the display of failure items and the reproduction of trace data in the conventional failure information monitoring method are configured as described above, it is a prerequisite that the control power supply voltage is established first, and this is combined with the use of volatile memory. Reset the control power to a certain value at the beginning of the program when starting the microcomputer program because the value becomes undefined when the control power is turned on due to a power failure after a failure or inadvertent human error, or in a volatile memory such as RAM. However, there is a problem that RAM data may be lost at that time. Further, the non-resident card for multi-output trace data payout has a problem that the control power supply must be turned off once and the RAM cannot be used by such a control method. In addition, there is a problem in that failure information, trace data, and the like are erased when a failure reset is performed because operation is prioritized.

The present invention has been made to solve the above problems, and in the event of a power failure or control power interruption, or even after a failure reset with operation priority, the failure item display and trace data are always saved, and a power failure occurs. An object of the present invention is to obtain a failure information monitoring method capable of performing failure diagnosis work even in all states after restoration, control power-on, or operation restart after failure reset.

[Means for solving problems]

The failure information monitoring method according to the present invention is provided with a non-volatile memory, a control power source input voltage monitor, a failure reset switch, a failure display reset switch and the like, and monitors failure information by a software algorithm.

[Work]

The microcomputer system according to the present invention, when a failure occurs,
The first processing means for stopping the failure processing and collecting the failure information, setting the initial memory clear stop flag in the failure information storage area of the non-volatile memory and displaying the failure, and the input voltage monitoring means. It is determined whether the detected decrease in the input voltage occurs during the operation of the controlled object, and if it occurs during the operation, the stop processing and the collection of the failure information are stopped and the nonvolatile memory initial stop flag is written to the nonvolatile memory. If it occurs other than during operation, determine whether the failure reset switch and the failure display reset switch are reset, and if they are reset, reset and reset the initial memory clear stop flag. If not, execute the interrupt process to set the initial memory clear stop flag Processing means and an interrupt prohibition at the rise of the input voltage, and determines whether the memory clear stop flag at initial initialization is set in the failure information storage area. If it is set, other than the failure information storage area Third processing means for initializing the area of the non-volatile memory, initializing the whole area of the non-volatile memory if not set, and then performing initialization processing for releasing the interrupt prohibition After the write protection of the third processing means is released, the fourth processing means receives the reset signals of the failure reset switch and the failure display reset switch, and clears the failure information in the failure information storage area and the initial memory clear. The stop flag is reset, and the writing of the failure information to the nonvolatile memory is started.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, parts that are the same as those in FIG. 3 are shown with the same reference numerals. In FIG. 1, 8 is a failure display reset switch of the microcomputer system 2, 9 is an input voltage monitor of the control power supply 1,
Reference numeral 10 is a control power supply input voltage monitored by the input voltage monitor 9, and 11 is, for example, EE (Electrically erasable) PRO.
It is a non-volatile memory such as M or battery-backed RAM. FIG. 2 is a schematic flowchart showing the fault information monitoring algorithm of the present invention in the microcomputer system 2 of FIG.

Next, the operation will be described. First, for convenience of explanation, a fault monitoring algorithm after a fault has occurred will be described. When a failure occurs, the failure processing program shown in FIG. 2 (c) is executed. This process is performed depending on the level of the failure, and whether the operation is stopped at the timing of stopping the failure processing such as stopping the output of the power converter 3 in FIG. 1 and storing the trace data in the non-volatile memory at the time of the serious failure. Processing of whether or not,
And a process of whether or not to start outputting the content of the failure that occurred in the system of FIG. 1 to the display device 6. Next, the process B of FIG. 2A is one of the processes in the main routine standby loop, and is a flowchart of the process related to the failure reset and the failure display reset. After the occurrence of a failure, the operation cannot be resumed and the failure display reset does not work unless the failure reset switch 7 shown in FIG. 1 is reset. After the failure reset is given to give priority to restarting the operation, the trace data is not rewritten and the data value group is held until the failure display reset is reset by the failure display reset switch 8 in FIG. In such a state, the failure display is also continued. By this operation, the cause of the failure after the electric motor 4 is restarted quickly can be pursued. Next, when the failure display reset by the failure reset 7 is executed, the failure display is immediately extinguished, and the failure information is all erased such as the re-storing of the trace data is started. The process from the occurrence of a failure to the failure reset to the completion of the processing algorithm for the failure display reset ends with the above processing, but the processing procedure when the control power supply voltage continues to decrease will be described next.

With the input voltage monitor 9 of FIG.
When a decrease in the number of times is detected, an interrupt process shown in FIG. 2 (b) is executed. First, it is determined whether or not the input voltage 10 of the control power supply 1 has dropped during the operation of the motor, and if a voltage drop occurs while the motor 4 is stopped, the voltage drop is not regarded as a failure, but another failure occurs. If the voltage drops after the failure display reset process is completed, the write stop flag (hereinafter, flag x
Will be abbreviated). If not, the flag x is set. These processes are based on the premise that a control power supply drop during a stop is regarded as a control power supply input being turned off artificially, not due to a power failure.
Next, when the control power supply input voltage drops during operation, it is considered as a power failure even if it was caused by an original power failure, or even if the control power was turned off due to human error, and system-specific power failure processing is executed. , Consider power failure as a kind of failure,
Stops storing trace data. Then, the flag x is set next, and the process ends.

After the power failure is recovered or the control power input is artificially turned on, the microcomputer system 2 in FIG. 1 is reset when the power supply voltage rises, and the process is restarted from the beginning of the main program in FIG. 2 (a). At the beginning of the main program,
The interrupt process is prohibited, the reset initialization routine of the CPU peripheral circuit is executed, the start of the interrupt process is permitted, and the process becomes a standby loop for performing the start / stop sequence process of FIG. RAM when interrupt processing of main routine is prohibited
Area verification (data processing operation completion check) check and initialization (data is undefined when control power is on, so it is normally set to 0.) There is processing A, but here, the above-mentioned nonvolatile memory Flag x in the region
Is first determined. As described above, the flag x is set when the control power supply voltage drops in the state where the failure display reset is not executed after the failure occurs,
2 when the control power supply voltage drops during operation (power failure detection)
Here is an example. Therefore, since the failure information on the non-volatile memory (the power failure is also considered as a failure as described above) is not reset by this process A, if the flag x is set, the failure information storage area in the non-volatile memory Verify initialization of a writable and readable memory such as RAM is executed, and if the flag x is reset, verify initialization of all areas is performed.

Next, when the main routine process B is executed, if the failure information remains in the non-volatile memory area, the information indicating whether or not the failure reset and the failure display reset are performed is also left therein. Therefore, the failure display is restarted as if the control power supply was lowered, that is, there was no power failure or artificial control power-off (the power failure display is displayed in the case of a power failure). Thus, the trace data is also held in the non-volatile memory area as the signal waveform data of each part at the time of occurrence of a failure, which means the failure display.

In the above-described embodiment, the example in which the process at the time of power failure used for the failure diagnosis of the electric motor control device is processed as a failure has been described, but the same effect as described above can be obtained without causing a failure like in the case of restarting after an instantaneous power failure.

Furthermore, the level of the failure may be classified into a major failure, a minor failure, etc., and the display method may be divided.

Further, although the above embodiment has described the failure monitoring of the electric motor control device, the invention is not particularly limited as long as it is an application requiring failure monitoring in a control system equipped with a microcomputer system.

〔The invention's effect〕

As described above, according to the present invention, the failure reset procedure in the failure monitoring of the electric motor control device is divided into two, that is, the failure reset and the failure display reset, and the failure information storage system by the non-volatile memory is adopted to skillfully manage them. Since the program configuration is used, the trace data of the control target is always saved in the failure information storage area of the non-volatile memory even after restarting operation after the control power supply is cut off or the fault is reset due to a power failure or artificial malfunction, and a power failure is restored. Alternatively, there is an effect that the failure diagnosis work can be performed in all the states after the control power supply is turned on or the operation is restarted after the failure reset.

[Brief description of drawings]

FIG. 1 is a block diagram of a microcomputer control device for an electric motor including a failure information monitoring system according to an embodiment of the present invention, FIG. 2 is a flowchart showing the failure information monitoring algorithm of FIG. 1, and FIG. FIG. 4 is a configuration diagram of a microcomputer control device for an electric motor including a failure information monitoring system, and FIG. 4 is a flowchart of a ROM storage program in a conventional device. 1 is a control power source, 2 is a microcomputer system, 3 is a power converter, 4 is an electric motor, 5 is a signal input device, 6 is a failure indicator,
7 is a failure reset switch, 8 is a failure display reset switch, 9 is an input voltage monitor, 10 is a power supply input voltage for control,
11 is a non-volatile memory. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A non-volatile memory for storing failure information detected from each part of a controlled object, an input voltage monitoring means for monitoring a decrease in an input voltage supplied to the controlled object, and an operation start of the controlled object after a failure occurs. Equipped with a microcomputer system that connects a failure reset switch that instructs the generation of conditions and a failure display reset switch that resets the failure display,
The microcomputer system, when a failure occurs, stops the failure processing and the collection of the failure information, sets a memory clear stop flag at initial time in the failure information storage area of the nonvolatile memory, and performs a failure display. Means and
It is determined whether the decrease in the input voltage detected by the input voltage monitoring means has occurred during the operation of the controlled object, and if it occurs during the operation, the stop processing and the collection of the failure information are stopped and the nonvolatile memory is stored. Set the memory clear stop flag at initial, and if it occurs other than during operation, determine whether the failure reset switch and the failure display reset switch are reset, and if reset, do the memory clear stop flag at initial. Second, and if not, execute an interrupt process to set the initial memory clear cancellation flag
And the processing means for prohibiting an interrupt at the rise of the input voltage to determine whether a memory clear stop flag at initial initialization is set in the failure information storage area, and if it is set, the failure information storage area Initialize all areas of the non-volatile memory other than, if not set, initialize all areas of the non-volatile memory,
After that, third processing means for executing an initialization process for canceling the interruption prohibition, and after canceling the write prohibition of the third processing means,
Upon receiving the reset signals of the failure reset switch and the failure display reset switch, the failure information in the failure information storage area and the initial memory clear stop flag are reset, and the writing of the failure information to the nonvolatile memory is started. And a fourth processing means for performing the failure information monitoring method.