JP2877491B2 - Combustion control device - Google Patents

Description

The present invention relates to a combustion control device used in fan heaters, hot air heaters, hot water heaters, and the like that use oil or gas as fuel.

(B) Conventional technology Conventionally, this type of combustion control apparatus has been disclosed in Japanese Utility Model Publication No. 63-35242.
As disclosed in Japanese Unexamined Patent Publication, a microcomputer that controls combustion of a combustion device in response to a detection signal input such as a temperature or a setting signal input has been used to perform precise combustion control.

FIG. 3 shows a conventional oil fan heater combustion control device. In FIG. 3, (1) shows a central processing unit (CPU), a data memory (RAM), and a program memory (RO).
M) and a microcomputer (hereinafter referred to as a microcomputer) incorporating an A / D conversion unit (A / D) and the like. An operation switch (2), a temperature setting device (3), Room temperature sensor (4), burner temperature sensor (5),
A frame rod (6) and an overheat prevention thermoswitch (7) are provided. The output side of the microcomputer (1) is provided with a vaporization heater (9), a burner fan (10), a fuel pump (11), a spark plug (12), a convection fan (13), and a digital display (14). ing. The ROM stores a combustion program, and the RAM stores various data such as temperature data detected by a room temperature sensor (4) and temperature data set by a temperature setting device (3). Then, the combustion control is performed by executing the combustion program by the CPU.

(C) Problems to be Solved by the Invention Incidentally, in the above-described combustion control device, if there is a power failure or the user intentionally turns off the power, all the abnormal content data stored in the RAM is lost. For this reason, even when there is an abnormality that requires repair in the combustion device, there is a concern that the error is temporarily released, combustion is repeated, and the combustion device is damaged.

The present invention has been made in view of the above-described facts, and has an object to improve the safety of a combustion device by preventing data of the content of the abnormality from being lost due to a power failure or the like when there is a significant abnormality. I do.

(D) Means for Solving the Problems According to the present invention, in a device for controlling combustion of a combustion device by executing a program stored in a microcomputer, a nonvolatile memory for electrically writing and erasing data, The data memory (RAM), which holds the data only during power-on, and for important abnormalities such as burner temperature abnormalities, writes the details of the abnormalities to non-volatile memory. For normal abnormalities other than the above, there is provided a data writing means for writing abnormal data to the RAM, and a non-volatile memory is provided with a data erasing means for erasing the written abnormal content data, and the data erasing means is provided with an abnormal data. Instruction means for instructing the erasure of the content data, and when the abnormal content data is stored in the nonvolatile memory or the RAM. In
The combustion operation is stopped until the abnormal content data is deleted.

Further, in such a combustion control device, the microcomputer has both data writing means and data erasing means, and has a built-in RAM and a nonvolatile memory.

(E) Function Since the important abnormality content data is written in the non-volatile memory, it is not lost even if there is a power failure or the user intentionally turns off the power. Because of this,
Combustion can be prevented from being repeated. Of course, after repairing the abnormal part, if the instruction means is operated, the data of the abnormality content in the nonvolatile memory is erased by the data erasing means,
Combustion becomes possible. Further, with respect to a normal abnormality such as filter clogging, if the operation switch is turned on again except for the cause of the abnormality such as cleaning of the filter, the abnormality content data in the RAM is erased, and the combustion operation becomes possible.

In the combustion control device according to the second aspect, the nonvolatile memory is built in the microcomputer, and the data writing means and the data erasing means also function as the microcomputer, so that the apparatus can be made compact.

(F) Embodiment Hereinafter, embodiments of the present invention shown in the drawings will be described.

FIG. 1 shows an embodiment in which the combustion control device of the present invention is applied to a petroleum fan heater.

In FIG. 1, the microcomputer (1) is different from the conventional one shown in FIG. 3 in that a nonvolatile memory (15) such as an EEPROM is used.
And the data writing means for writing the abnormal content data to the nonvolatile memory (15) and the data erasing means for erasing the abnormal content data written to the nonvolatile memory (15). is there. On the input side of the microcomputer (1), an instruction switch (instruction means) (16) for instructing the microcomputer (1) to delete the abnormal content data is provided. The indicator switch (16) is mounted on a hard-to-see place such as a circuit board inside the oil fan heater body.

In the above-described combustion control device, as shown in FIG. 2, when the microcomputer (1) is powered on, the reset state is released and the combustion program is executed. Further, initial data such as set temperature data is set in the RAM. At this time, if there is abnormal content data in the non-volatile memory, it is determined that repair of the combustor has not been completed, an error occurs, and the operation switch is not turned on. If there is no data in the nonvolatile memory, when the operation switch (2) is turned on, the microcomputer (1)
Energizes the vaporization heater (9) and causes the vaporization heater (9) to raise the temperature of the vaporization section of the burner (not shown). When the vaporization section is sufficiently heated and the temperature detected by the burner temperature sensor (5) becomes equal to or higher than the set temperature, the burner fan (10) is operated, the burner is pre-purged, and then the fuel pump (11) is operated. Activate the spark plug (12). As a result, when the burner burns and the current flowing through the flame rod (6) exceeds a set value, the microcomputer (1) stops the operation of the ignition plug (12). During such a combustion operation, the microcomputer (1) calculates by calculation the temperature difference between the set temperature adjusted by the temperature setting device (3) and the room temperature detected by the room temperature sensor (4), and according to the difference temperature. Determine the amount of combustion. Then, while controlling the frequency of the fuel pump (electromagnetic pump) (11) so as to obtain the combustion amount,
The rotation speed of the burner fan (3) is controlled. In addition, a convection fan (13)
Is operated at the set number of revolutions so that the room temperature is maintained at the set temperature. In addition, the room temperature and the set temperature are digitally displayed on the display (14).

The burner temperature sensor (5) is disconnected, or there is an abnormality in the power supply control unit of the vaporization heater (9). If the detected temperature of the temperature sensor (5) does not rise to the set temperature, the microcomputer (1) determines that there is an important abnormality in the burner temperature, and the abnormality content data is written to the non-volatile memory (15). The combustion operation is stopped, and the digital display (14) displays an error (for example, E8) according to the abnormality content data. Conversely, the same applies when the temperature detected by the burner temperature sensor (5) rises abnormally, and the combustion operation is stopped, and the digital display (14) displays, for example, EA, and repairs by a necessary service person are performed. The processing for dealing with the abnormality is performed. In the non-volatile memory, even if there is a power failure or the user intentionally turns off the microcomputer (1), the data of the abnormal content is not lost, and the combustion is not repeated with the abnormal condition. In addition, the serviceman can know the contents of the abnormality by looking at the digital display (14),
By simply operating 6), the abnormal content data stored in the nonvolatile memory (15) can be erased and combustion can be restarted.

When the current value of the flame rod (6) decreases or the overheat prevention thermo switch (7) is activated during combustion, the microcomputer (1) writes these abnormal contents data to the RAM and stops the combustion operation. An error display (for example, E2 and E7) corresponding to each abnormality content data is displayed on the digital display (14). Such an abnormality is eliminated by ventilating the room or cleaning the filter. In this way, if the user looks at the digital display (14), takes appropriate measures, and turns on the operation switch (2) again, combustion can be resumed.

(G) Effect of the Invention Since the present invention is configured as described above, if there is an important abnormality such as a temperature abnormality of the combustion device that requires repair by a specialized service person, the data of the abnormality is described as a power failure. Can be prevented from disappearing, and there is no fear that combustion will be repeated with an abnormality, and safety can be improved.On the other hand, for ordinary abnormalities that occur daily,
If the countermeasures are taken to eliminate the abnormal content indicated in the abnormal display and the power is turned on again, the data in the RAM is erased and the combustion can be restarted.

Further, in the combustion control device according to the second aspect, the device can be made compact, the number of wirings can be reduced, and the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a combustion control device showing one embodiment of the present invention, FIG.
FIG. 3 is a block diagram of a conventional combustion control device. (1)... A microcomputer serving also as a data writing means and a data erasing means, (15)... A nonvolatile memory, (16)... An instruction switch (instruction means).

Claims (2)

(57) [Claims] An apparatus for controlling combustion of a combustion device by executing a program stored in a microcomputer, wherein a non-volatile memory for electrically writing and erasing data and a memory for holding the written data are energized. Data is written only to the data memory (RAM), and if the error is an important error such as a burner temperature error, the error content data is written to non-volatile memory. Data erasing means for writing abnormal data to the nonvolatile memory, and erasing the abnormal content data written in the nonvolatile memory; and instructing means for instructing the data erasing means to erase the abnormal content data. In addition, when the abnormality content data is stored in the non-volatile memory or the RAM, the abnormality content data is Until it is removed by, combustion control apparatus characterized by being configured so as to stop the combustion operation. 2. The combustion control device according to claim 1, wherein the microcomputer has both data writing means and data erasing means and has a built-in RAM and a nonvolatile memory.