JPH08296837A - Controller for combustor - Google Patents

Abstract

PURPOSE: To provide a controller for a combustor with a higher safety which achieves higher reliability in writing operation when a control data for combustion is stored into a memory. CONSTITUTION: This apparatus is provided with a memory means 4 to store a control data and a microcomputer 2 to control a data reading/writing operation of the memory means 4. In the operation of writing data into the memory means 4, the end of writing data is judge only when a writing end output DO from the memory means 4 is detected continuously a plurality of times at a specified cycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor whose operation is controlled by a microcomputer, and more particularly to a combustor control device equipped with storage means for storing device control data.

[0002]

2. Description of the Related Art Conventionally, a combustor of this type has a microcomputer (hereinafter referred to as a microcomputer) mounted inside the machine.
Is controlled by the EEP-ROM when the power is turned on.
Etc., various control data (for example, hot water supply set temperature data, shower set temperature data, bath set temperature data, bath water level position data, etc.) stored in a readable / writable non-volatile memory are loaded into the microcomputer, and Combustion control of the equipment is performed with reference to the control data. In addition, the above control data is constantly updated on the microcomputer while the equipment is operating, but in the event of an emergency stop due to a power outage, etc. The data is saved in the memory, and after the power failure is restored, the saved data is again taken into the microcomputer.

[0003]

FIG. 3 is a conventional operation flowchart for saving the control data in the storage means. As shown in this flowchart, the control data is stored in the memory (EEP-RO) at the time of power failure or data clear.
When writing to M), the microcomputer detects the write end output from the memory after data transfer, determines the write end of the transferred data, and repeats the detection operation to hold all control data. (16 words) was saved in the memory. However, at the time of writing, if the write end output is detected only once and the write end is confirmed, uncertain data will be stored in the memory when the microcomputer mistakenly recognizes noise etc. as the write end output. As a result, there is a risk that an erroneous temperature setting will be made, which causes a problem in reliability of the combustor.

It is an object of the present invention to provide a highly safe combustor control device which solves the above-mentioned inconvenience and improves the reliability of the control data saving operation.

[0005]

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 write operation to the storage means. At this time, the data write end is determined only when the write end output from the storage means is continuously detected a plurality of times in a predetermined cycle.

Further, the present invention comprises a storage means for storing control data and a microcomputer for controlling a data read / write operation of the storage means, and data to the storage means at the time of power failure or data clear When writing,
Only when the write end output from the storage means is detected a plurality of times in a predetermined cycle in succession, the data write end is determined.

[0007]

With the above-described structure, in the present invention, when the control data is written, the write end output sent from the storage means is checked by the microcomputer a plurality of times at a predetermined cycle,
If the write end output can be continuously confirmed a predetermined number of times, it is judged that the data write has been normally completed.

Accordingly, by appropriately setting the write end check cycle and the number of checks, even if a noise or the like is accidentally recognized as a write end output "present",
Since the probability of this false recognition occurring a predetermined number of times in succession is extremely small, the reliability of the memory write operation is significantly improved.

[0009]

1 is a block diagram showing an embodiment of a control device for a combustor according to the present invention.

In the figure, reference numeral 2 is a microcomputer for collectively controlling the combustion operation of equipment.
A non-volatile memory, such as an EEP-ROM, is connected as a storage unit 4 for storing various control data required for combustion control of equipment such as shower set temperature data, bath set temperature data, and bath water level position data. This EEP-
ROM4 has a data clock CL and a chip select CS
, Data input DI, data output D0, etc. are provided, and the ports P0, P1, P3 of the microcomputer 2 are respectively provided.
It is connected to the.

The ports P4 and P5 of the microcomputer 2 are
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 are connected, and a combustion control circuit 5 is also connected.

The control device for the combustor according to the present invention has the above-mentioned configuration, and the control data saving operation, which is the object of the present invention, will be described below with reference to the operation flowchart of FIG.

This flow chart shows the control operation when writing the control data on the microcomputer 2 and the initial value data to the storage means 4 at the time of a power failure or when the clear SW3 is operated.

In this embodiment, the memory means 4 is an electrically erasable / writable serial memory (EEP-R).
OM) is used, and the data clock C described above is used.
Under the control of L, chip select CS, data input DI, data output DO, etc., the data read / write operation by the microcomputer 2 is executed.

First, the presence or absence of data writing is determined by the pulse signal from the power failure detection circuit 1 or the switch pressing signal of the clear SW3. 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 to the EEP-ROM 4 (data save), and when the clear SW3 is operated, the EEP- R
The content of OM4 is set to the initial value.

In either case, the microcomputer 2 sets the chip select signal Cs of the port P0 to "H" at the time of memory writing.
, And write address and control data (initial value data when the clear SW is pressed) from the port P2 in synchronization with the data clock CL from the port P1.
Output to OM4 and start transfer of control data DI. 1
After word data transfer is completed, chip select Cs
When "L" is set to "L", the EEP-ROM 4 executes the writing of the control data DI received at the designated memory address, and sends the write end confirmation signal (READY) to the data output Do. Microcomputer 2 is connected via port P3
This writing end output D0 is detected to confirm the end of writing the control data DI in the memory.

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 (100 μsec). The microcomputer 2 judges the normal writing end of the control data DI when it is confirmed that the writing end output “exists” twice in succession, and repeats the same check while sequentially transferring the remaining data, so that all the data of 16 words Execute writing.

As described above, the write end output D0 "present" from the EEP-ROM 4 is output a plurality of times (in this embodiment, 2).
It is possible to prevent erroneous recognition of confirmation of writing completion at the time of writing data by checking continuously. That is, the write end check cycle is set to 100 as in the present embodiment.
If the noise width is set to be sufficiently larger than the expected noise width, such as μsec, even if noise is mistakenly recognized as the write end output D0 “present” when confirming the presence or absence of the write end output, after 100 μsec The above-mentioned noise is present at the time of the second check of, and the probability that noise is newly generated by this timing is extremely small.
It is possible to significantly improve the reliability of the writing operation.

The above is the details of the write operation of the control data DI, but the check cycle and check frequency of the write end output D0 are not limited to those in the above embodiment, and are optimal in view of the circuit configuration and the processing time of the microcomputer 2 and the like. The conditions can be set appropriately. Further, as the storage means 4, an EE-PROM is used.
However, the present invention is not limited to this, and the present invention can be applied to writing to a battery RAM or the like.

[0020]

As described above, according to the present invention, the memory means for storing the control data and the microcomputer for controlling the data read / write operation of the memory means are provided, and the data writing to the memory means is performed. At the time of operation, it is determined that the data writing is completed only when the writing completion output from the storage means is detected a plurality of times in succession in a predetermined cycle. Improves reliability.

Further, by applying the continuous detection of the write end output to the data saving operation in case of a power failure or the like, highly reliable control data can always be held in any case, and the safety of the device is further ensured. Can be secured.

[0022]

[Brief description of 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 combustor control device.

FIG. 3 shows an operation flowchart of a control device for a conventional combustion device.

[Explanation of symbols]

 2 Microcomputer 4 Storage means (EEP-ROM)

Claims (2)

[Claims] 1. A storage means for storing control data, and a microcomputer for controlling a data read / write operation of the storage means, wherein data is written from the storage means when the data is written in the storage means. A control device for a combustor, which determines that data writing is completed only when an end output is detected a plurality of times consecutively in a predetermined cycle. 2. A storage means for storing control data and a microcomputer for controlling a data read / write operation of the storage means are provided, and when data is written to the storage means at the time of power failure or data clear. A controller for a combustor, characterized in that it is judged that data writing is completed only when a writing completion output from the storage means is detected a plurality of times consecutively in a predetermined cycle.