JPS633126A - Control of combustion apparatus - Google Patents

Abstract

PURPOSE:To permit a combustion apparatus to be stopped when the content of an EPROM is changed, by a method wherein the total sum of the contents of the EPROM is obtained during the operation of the combustion apparatus and is compared with an initial value. CONSTITUTION:An input and output circuit 23 is connected to a control unit 22, constituted of a micro-computer, while the control unit 22 is connected to an EPROM 21. Necessary combustion program and data are writen previously into an area from an address 0 to the address (n) in the EPROM 21 through the control unit 22. Combustion is effected by a method wherein, the combustion program in the EPROM 21 is read by the control unit 22 to operate the input and output circuit 23 and regulate the opening degree of a solenoid valve 25 based on the program. When the new content of an accumulator is zero, it is decided that the contents of the addresses 0-(n) are the same as writen already and they are not changed, therefore, the combustion is returned to the combustion program. When said content is not zero, it is decided that the contents of the addresses 0-(n) are changed, therefore, a command to close the solenoid valve 25 fully is outputted and the combustion in a burner 26 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for controlling combustion equipment, and particularly to a method for checking the contents of an EPROM 2 in a combustion control device using an EPROM.

(Prior Art) In recent years, combustion control devices using microcomputers have been installed in gas combustion equipment to operate them more safely or based on preset combustion programs. became. This combustion control device generally has a built-in ROM, and this ROM
The combustion program is stored in.

However, when it is not possible to mask the ROM due to small loft production, etc., an erasable and writable EPROM 21 has been used instead of the ROM, as shown in FIG. That is, the combustion program and necessary data are stored in the EPROM 21 in advance, and the control unit 22 consisting of a microcomputer reads the combustion program in the EPROM 21 and operates the input/output circuit 23 based on this, and the control section 22 reads the combustion program from the EPROM 21 and operates the input/output circuit 23 based on this. The opening degree of the provided =m valve 25 and the amount of air blown by the blower fan (not shown) are adjusted.

Thereby, the combustion state of the burner 26 is controlled.

(Problems to be Solved by the Invention) However, since EPROM is an erasable element, there is a risk that the contents of the EPROM may be erased by ultraviolet rays or the like. If the contents written in the EPROM change in this way, the combustion program becomes incorrect, causing abnormal operation of the combustion equipment and causing safety problems.

Thus, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for controlling a combustion engine that can detect a change in the contents of an EP ROM and stop the combustion equipment. It is in.

[Configuration 1 of the Invention (Means for Solving the Problems) In order to achieve the above object, the control method of the present invention
In the method of controlling the combustion state of the combustion equipment based on the contents written in the OM, the total sum of the contents is calculated when writing the contents of the EPROM, and this is stored as an initial value in the EPROM, and the combustion equipment During operation, the sum of the contents of the EPROM is calculated and compared with the initial value, and if the two differ, the combustion equipment is stopped.

(Function) By using the above method, the EPROM
If the contents written in the burner change afterward due to ultraviolet rays or the like, the total sum of these will change, so this change will be detected as a result of a comparison performed while the combustion equipment is in operation, and the combustion equipment will be stopped.

That is, even if the combustion program or data in the EPROM changes and becomes incorrect, abnormal operation of the combustion equipment is prevented.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

The method of the present invention was carried out using an apparatus having a configuration similar to that of the combustion control apparatus shown in FIG. That is, burner 2
A solenoid valve 25 is provided on a gas supply pipe 24 that supplies gas to the valve 6, and an input/output circuit 23 for adjusting the valve opening is connected to the solenoid valve 25. Furthermore, input/output circuit 2
3 is connected to a control section 22 consisting of a microcomputer, and an EPROM 21 is connected to this control section 22.

The necessary combustion program and data are written in the area from address 0 to n in the EPROM 21 through the control unit 22 in advance. Furthermore, after writing these contents,
That is, the contents written from address 0 to address n are sequentially added to obtain a total sum, each bit of this sum is inverted and 1 is added to it to calculate a check sum CKSUM, and this check sum CKSUM is stored in address n+i of the EPROM 21. I'll keep it. Here, an example of how to create the checksum CKSUM will be shown. 2-bit data is stored in each address from address 0 to address 2 of the EPROM 21.
1, 1 address 11. 2 address 10, the lower 2 bits 1 of 110 are obtained by converting these data into binary numbers.
0 is the total sum, and 1 is added to 01, which is the inverted version, to make 1.
0 is the checksum. This checksum 10 is stored at address 3.

Combustion begins in this condition. The combustion is carried out by the control section 22.
This is performed by reading the combustion program in the EPROM 21, operating the input/output circuit 23 based on the combustion program, and adjusting the opening degree of the solenoid valve 25. A check routine, which is a feature of the present invention, is provided within the combustion program.

This check routine will be explained below based on the flowchart shown in FIG.

First, accumulator A and address H are initialized (processing a, b), and the contents of accumulator Δ are replaced with the contents of address H added to them (processing C).
. Next, address H is incremented by 1 (processing d), and it is determined whether the new address H has reached address n+1 or not. Processing e
), if the address is not yet n+1, process C again.
Returns to and transfers the contents of the new address 1 to the accumulator. In this way, address H becomes n+
Processes C and d are repeated until address 1 is reached. That is, when address H reaches address n+1, the sum of the contents from address 0 to address n is held in accumulator A.

Then, as a result of process e, when it is determined that address 1 has become address n1,000, the contents of accumulator A are previously set to n+
Add the checksum CKSUN・1 stored at address 1 and make this the new content of accumulator A (
Processing f). Roughly speaking, the new contents of accumulator A are O
It is determined whether or not it is (processing g), and if it is O, it is determined that the contents from address ○ to address n are the same as at the time of writing and there is no change, and the process returns to the combustion program. It is determined that there has been a change in the contents up to address n, and a command is output to fully open the solenoid valve 25 (
Process h), whereby combustion in the burner 26 is stopped.

As mentioned above, this check routine allows EPRO
It is possible to check whether the contents previously written in M21 have changed since then, and if so, the combustion equipment can be stopped.

In the above embodiment, the control unit 22 and the EPROM 21 are configured independently, but they may be integrated using a microcomputer with a built-in EPROM.

Furthermore, if it is not necessary to check all of the contents written in the EPROMIC, the configuration may be such that only the main parts are totaled and checked.

[Effects of the Invention] As explained above, according to the present invention, the following excellent effects are exhibited.

It is possible to check whether the contents previously written in the EPROM have changed since then, and if the contents have changed, the combustion equipment can be safely stopped, thereby improving the reliability of the combustion equipment.

[Brief explanation of the drawing]

Fig. 1 is a flowchart for explaining a combustion shield control method according to an embodiment of the present invention, and Fig. 2 is a general combustion shield control method. 11 is a configuration diagram of the No. 11 device. Agent Patent Attorney Noriyuki Chika
Yuki Katayama Mistakes Figure 1 Figure 2

Claims (1)

[Claims] In a method for controlling the combustion state of a combustion device based on contents written in an EPROM, the total sum of the contents is calculated when writing the contents of the EPROM, and this is stored as an initial value in the EPROM, and the combustion device A method for controlling a combustion equipment, characterized in that the sum of the contents of the EPROM is calculated during operation of the EPROM, the sum is compared with the initial value, and the combustion equipment is stopped if the two differ.