JP3667815B2 - Combustor control device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a combustor that performs operation control by a microcomputer, and more particularly, to a combustor control device equipped with a storage means for storing device control data.
[0002]
[Prior art]
Conventionally, this type of combustor is controlled by a microcomputer (hereinafter referred to as a microcomputer) installed in the machine, and stored in a readable / writable nonvolatile memory such as an EEP-ROM when the power is turned on. Various control data (for example, hot water set temperature data, shower set temperature data, bath set temperature data, bath water level position data, etc.) are taken into the microcomputer, and combustion control of the equipment is performed with reference to these control data. In addition, the above control data is constantly updated on the microcomputer while the equipment is in operation. However, in the event of an emergency stop due to a power failure, the control data on the microcomputer is temporarily non-volatile immediately before the power is turned off to retain the latest control data. The data is saved in the memory, and the saved data is again taken into the microcomputer after the power failure is restored.
[0003]
[Problems to be solved by the invention]
FIG. 3 is a flowchart of a conventional operation when the control data is saved in the storage means. As shown in this flowchart, when writing control data to the memory (EEP-ROM) at the time of power failure or data clear, the microcomputer detects the write end output from the memory after data transfer, and transfers the transferred data. By determining the end of writing and repeatedly performing the detection operation, all control data (16 words) to be held is saved in the memory. However, at the time of writing, if the writing end output is detected only once and the writing end is confirmed, if the microcomputer erroneously recognizes noise etc. as the writing end output, uncertain data will be stored in the memory, As a result, there is a risk that an incorrect temperature is set, which causes a problem in the reliability of the combustor.
[0004]
An object of the present invention is to provide a highly safe combustor control device that eliminates the above-mentioned disadvantages and improves the reliability of control data saving operation.
[0005]
[Means for Solving the Problems]
That is, the present invention comprises a storage means for storing control data and a microcomputer for controlling the data read / write operation of the storage means, and the data is read from the storage means during the data write operation to the storage means. Only when the write end output is continuously detected a plurality of times at a predetermined cycle, it is determined that the data write is completed.
[0006]
The present invention also comprises a storage means for storing control data and a microcomputer for controlling the data read / write operation of the storage means, and when data is written to the storage means at the time of power failure or data clear. In addition, it is determined that the data writing is completed only when the writing end output from the storage means is continuously detected a plurality of times in a predetermined cycle.
[0007]
[Action]
With the above configuration, in the present invention, when the control data is written, if the write end output sent from the storage means is checked a plurality of times at a predetermined cycle by the microcomputer, and if the write end output can be confirmed continuously a predetermined number of times, the data writing is completed. It is determined that the process ended normally.
[0008]
Therefore, by setting the write end check cycle and the number of checks as appropriate, even if noise or the like is mistakenly recognized as being “write end output”, the probability that this misrecognition will occur continuously a predetermined number of times becomes extremely small. Therefore, the reliability of the memory write operation is significantly improved.
[0009]
【Example】
FIG. 1 is a block diagram showing an embodiment of a control device for a combustor according to the present invention.
[0010]
In the figure, 2 is a microcomputer that collectively controls the combustion operation of the equipment. This microcomputer 2 has various types of equipment necessary for combustion control of equipment such as hot water set temperature data, shower set temperature data, bath set temperature data, and bath water level position data. A nonvolatile memory, for example, an EEP-ROM, is connected as the storage means 4 in which the control data is stored. The EEP-ROM 4 has terminals such as a data clock CL, a chip select CS, a data input DI and a data output D0, which are connected to the ports P0, P1 and P3 of the microcomputer 2, respectively.
[0011]
The ports P4 and P5 of the microcomputer 2 are connected to a power failure detection circuit 1 for instructing data saving to the EEP-ROM 4 and a clear SW 3 for initializing the contents of the memory. In addition, a combustion control circuit 5 is provided. It is connected.
[0012]
The combustor control apparatus according to the present invention has the above-described configuration, and control data saving operation, which is the gist of the present invention, will be described below with reference to an operation flowchart of FIG.
[0013]
This flowchart shows the control operation when the control data, initial value data, etc. on the microcomputer 2 are written in the storage means 4 at the time of a power failure or when the clear SW 3 is operated.
[0014]
In this embodiment, an electrically erasable / writeable serial memory (EEP-ROM) is used as the storage means 4, and the data clock CL, chip select CS, data input DI, data output DO described above. Under such control, the data read / write operation by the microcomputer 2 is executed.
[0015]
First, the presence / absence of data writing is determined based on the pulse signal from the power failure detection circuit 1 or the switch pressing signal of the clear SW 3. When the pulse output of the power failure detection circuit 1 is stopped and the power failure state is confirmed, the control data on the microcomputer is written into the EEP-ROM 4 (data saving), and when the clear SW 3 is operated, the EEP- The contents of the ROM 4 are set to initial values.
[0016]
In either case, the microcomputer 2 sets the chip select signal Cs of the port PO to “H” and writes the write address and control data (initial value data when the clear SW is pressed) from the port P2 when writing to the memory. The data is output to the EEP-ROM 4 in synchronization with the data clock CL from P1, and the transfer of the control data DI is started. When the chip select Cs is set to “L” after the data transfer of one word is completed, the EEP-ROM 4 executes the writing of the received control data DI at the designated memory address, and the write end confirmation signal (READY) Is sent to the data output Do. The microcomputer 2 detects this write end output D0 via the port P3 and confirms the end of the memory write of the control data DI.
[0017]
When the first write end output D0 is confirmed, the presence or absence of the write end output D0 is checked again after a predetermined time (after 100 μsec). The microcomputer 2 determines the end of normal writing of the control data DI when it is confirmed that the write end output “Yes” is confirmed twice in succession, and repeats the same check while transferring the remaining data one by one. Perform writing.
[0018]
As described above, the write end output D0 “existing” from the EEP-ROM 4 is continuously checked a plurality of times (in this embodiment, twice) to prevent erroneous recognition of the write end confirmation at the time of data writing. it can. That is, as in this embodiment, if the period of the write end check is set to be sufficiently larger than the expected noise width, such as 100 μsec, in the unlikely event of checking the presence / absence of the write end output, noise or the like is generated. Even if the write end output D0 is misrecognized as “present”, the above-mentioned noise is present at the second check after 100 μsec, or the probability of newly generating noise due to this timing is extremely small. It becomes possible to remarkably improve the operation reliability.
[0019]
The above is the details of the write operation of the control data DI. However, the check cycle and the number of checks of the write end output D0 are not limited to the above embodiment, and the optimum conditions are appropriately determined from the circuit configuration, the processing time of the microcomputer 2, and the like. Can be set. Further, although EE-PROM is used as the storage means 4, the present invention is not limited to this, and the present invention can also be applied to writing to a battery RAM or the like.
[0020]
【The invention's effect】
As described above, according to the present invention, the storage means for storing the control data and the microcomputer for controlling the data read / write operation of the storage means are provided. The data write end is judged only when the write end output from the storage means is detected continuously a plurality of times at a predetermined cycle, so that a write malfunction due to noise or the like is prevented and the reliability of data saving is improved. To do.
[0021]
In addition, by applying the continuous detection of the write end output to the data saving operation in the event of a power failure, it is possible to always retain highly reliable control data in any case, and to ensure the safety of the device more reliably. .
[0022]
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a control device for a combustor according to the present invention.
FIG. 2 shows an operation flowchart of the control device for the combustor.
FIG. 3 shows an operation flowchart of a conventional combustion apparatus control apparatus.
[Explanation of symbols]
2 Microcomputer 4 Memory means (EEP-ROM)

Claims (2)

A storage means for storing the control data; and a microcomputer for controlling the data read / write operation of the storage means. A combustor control device that determines that data writing is completed only when it is detected a plurality of times continuously in a cycle. A storage means for storing the control data and a microcomputer for controlling the data read / write operation of the storage means are provided. The combustor control device determines that the data writing is completed only when the writing end output of is continuously detected a plurality of times in a predetermined cycle.

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