JPH0749232Y2 - Combustion equipment control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is generally applied to a combustion device control device having a plurality of inspection programs, which typically includes an inspection program for actually operating a load drive circuit of the combustion device to inspect it. Eliminates the risk of activation due to malfunction due to dew condensation, mixing of metal pieces, external noise, etc. when using, and the inspection program can be run only when one of a plurality of predetermined serial data is input to the microcomputer. The present invention relates to a combustion device control device that can be executed.

[Prior Art] Conventionally, in a combustion device control apparatus having various inspection programs built-in, in order to execute the inspection programs, a predetermined one input terminal of a microcomputer is normally set to "H" level. Every time, after the power supply of the microcomputer is turned on, the inspection program is executed when the input terminal is at “L” level.

For example, when there are four types of inspection programs, the inspection program execution input terminal 14 of the microcomputer 1 is as shown in FIG.
And two test program setting input terminals (E) 15 and (F) 22 are connected to a test program setting circuit 16 for switching between "H" level and "L" level of these terminals.

When the inspection program execution input terminal 14 becomes "L" level, the inspection program setting input terminal (E) 15,
By the combination of (F) 22, the inspection program (A) 3 is executed if E = “H” and F = “H”, and the inspection program (B) if E = “H” and F = “L”. ) 4 and then E
= “L” and F = “H”, the inspection program (C) 5 is executed, and if E = “L” and F = “L”, the inspection program (D) 6 is executed. When the execution input terminal 14 remained at "H" level, the normal sequence program was executed.

[Problems to be solved by the invention] Therefore, in the conventional method, even when the combustion device control device is to be normally operated, the inspection program setting circuit is broken, dew condensation is caused, metal pieces are mixed, and There is a possibility that the inspection program execution input terminal 14 is erroneously switched to the “L” level due to noise or the like, and the inspection program is executed to enable normal combustion control.

Further, in the above conventional apparatus, when there are four types of inspection programs, three microcomputer input terminals are required, and when the types of inspection programs increase, the number of input terminals also increases accordingly.

Therefore, if the microcomputer does not have enough input terminals, it is necessary to use an expansion LSI to execute the inspection program using the conventional method.
It is necessary to add a microcomputer or to use a microcomputer having a large number of input terminals, which has a drawback of increasing the manufacturing cost.

The present invention has been made in order to solve the above-mentioned problems, and prevents malfunction of an inspection program being executed when a normal sequence program should be executed, and mounts a plurality of inspection programs. A combustion device control device is provided.

[Means for Solving the Problem] A combustion device control apparatus according to the present invention is a combustion device control apparatus for controlling combustion operation by a microcomputer for controlling combustion operation, wherein the microcomputer 1 and a sequence for controlling operation of the combustion apparatus are provided. Program 2 and multiple inspection programs (A) 3, (B) 4, and (C) for conducting product manufacturing and shipping inspections
5, (D) 6 is stored in the memory element 7, and the microcomputer 1
Drive circuit 8 for driving various loads of combustion equipment according to the control of 1., switch input circuit 9 connected to sensors having contacts installed in various operation switches and combustion equipment, and thermistor for performing temperature control Temperature measuring circuit
10, a flame detection circuit 11 connected to a flame detector for monitoring the combustion state of the combustion equipment, a display device 12 for displaying the operating state of the combustion equipment, and a serial data receiving circuit 13 Serial data receiving circuit at the time of turning on
The microcomputer 1 decodes the serial data input to 13,
If the data is any one of a plurality of predetermined data set in advance, of the plurality of inspection programs (A) 3, (B) 4, (C) 5, (D) 6, One of
One inspection program is executed by the microcomputer 1.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 shows a combustion device control device 23 of the present invention and an inspection device for executing various inspection programs to check the combustion control device.
It is a figure which shows the combination of 24, The combustion apparatus control apparatus 23 is a microcomputer 1 which controls a combustion apparatus, a sequence program 2 which controls the operation of the combustion apparatus by this microcomputer, and a plurality of products for manufacturing and shipping inspection. Memory device 7 having inspection programs (A) 3, (B) 4, (C) 5, (D) 6
And drive circuit 8, switch input circuit 9, temperature measurement circuit 1
0, flame detection circuit 11, display device 1 showing the operating state of the combustion equipment
2 and a serial data receiving circuit 13 for executing various inspection programs.

The inspection program is an inspection program (A) 3 for inspecting a drive circuit 8 for driving a load of a combustion device (fuel valve of a boiler, fan motor, etc.) under the control of the microcomputer 1.
Inspection program (B) 4 for inspecting the switch input circuit 9 connected to a sensor having a contact point (an anti-vibration switch, a damper latch switch, a carbon monoxide sensor, an exhaust gas temperature sensor, etc.) installed in various operation switches and combustion equipment.
And an inspection program (C) 5 for inspecting the temperature measuring circuit 10 connected to the thermistor, and an inspection program (D) 6 for inspecting the flame detection circuit 11 connected to the flame detector for monitoring the combustion state of the combustion equipment. It consists of

On the other hand, the inspection device 24 is connected to the drive circuit 8 and includes a pseudo load circuit 17 that indicates that the load of the combustion device has been driven, and a sensor 18 that is connected to the switch input circuit 9 and that has switches and contacts of the combustion device. , Connected to the temperature measuring circuit 10,
A thermistor 19 for controlling the temperature, a pseudo flame signal generator 20 connected to the flame detection circuit 11, and a serial data reception circuit, and transmits predetermined serial data for executing the inspection program. It is composed of a serial data receiving circuit 21 capable of processing.

In the combustion device of the present invention, the drive circuit 8 is inspected by executing the inspection program (A) 3 to sequentially drive the drive circuits 8 of various loads of the combustion device, and the pseudo load circuit 17 corresponding thereto is activated. Make sure that you do.

In addition, the switch input circuit 9 is inspected by executing the inspection program (B) 4 and comparing the numbers displayed by the display device 12 with the sensors 18 and the like having various operating switches and contacts installed in the combustion equipment. Perform an inspection.

In addition, the inspection of the temperature measurement circuit 10 is performed by the inspection program (C).
5 is executed, the voltage drop corresponding to the predetermined temperature due to the internal resistance of the thermistor 19 is taken out by the temperature measuring circuit 10, and the voltage read by the microcomputer 1 is displayed on the display device 12 to display the predetermined temperature. The inspection is performed by comparing with the original data in. Further, the inspection of the flame detection circuit 11 is executed by executing the inspection program (D) 6, and the flame detection circuit 11 detects the current input from the pseudo flame detector 20 capable of flowing the current for the flame of a predetermined intensity. The voltage is converted into a voltage, and the data read by the microcomputer 1 is displayed on the display device 12 so as to be compared with the original data of a flame of a predetermined strength for inspection.

[Operation of the Invention] Next, the procedure of various inspection programs in the combustion device controller of the present invention will be described based on the flowchart shown in FIG.

When executing the inspection program, the serial data transmission circuit 21 is connected and operated, and the power is turned on.

The burner control device, which is turned on, performs the processing of the subroutine shown in FIG.

In FIG. 3, it is first checked in step 25 whether serial data has been received. When the serial data is received in step 25, the process proceeds to step 27 and it is checked whether the serial data is the same as the previous time. If they are the same, the process proceeds to step 28 and data reception is confirmed continuously for about 1 second (80 times).

If the data is not received continuously (80 times) in step 28, the process returns to step 25, and therefore steps 25, 26, and 27 are repeated until the data is continuously received 80 times.

If it is determined in step 28 that the data has been received 80 times in succession, the process proceeds to step 29.

In step 29, the received data is "1", "2", "3", "4"
It is determined which one of the above, and the process proceeds to step 30.

In step 30, the address of the program to proceed after this subroutine is completed is set. If the received data is any of "1", "2", "3", and "4", the inspection program (A), (B) corresponding to the received data,
An address is set so that (C) and (D) can be executed, and the process proceeds to step 31. Step 31 shows the end of this subroutine.

In normal use, the power is turned on without receiving serial data.
Proceed to. In step 26, it is checked whether or not one second has passed since the power was turned on. If one second has not elapsed, the process returns to step 25, and if one second has elapsed, the process proceeds to step 31 to end the subroutine. In this case, since the address of the inspection program is not set, the normal sequence program is executed after this subroutine is completed.

In step 27, if the received serial data is different from the previous one, the process returns to step 25.

Here, the reason for inputting the same data 80 times consecutively is
Due to an unintended cause such as external noise, any one of predetermined data “1”, “2”, “3”, “4” may be accidentally input to the serial data receiving circuit, and the inspection program may be erroneously executed. This is because the inspection program is executed only when these data are continuously input for about 1 second (about 80 times) in order to reduce the performance.

In addition, in the above-mentioned embodiment, the case where the data is continuously input 80 times has been described, but it is very unlikely that the predetermined data is accidentally entered, and even if the data is less than this, it is practical. There is no problem above.

[Effects of the Invention] As described above, according to the present invention, when the inspection program is executed, in order to make the input of the specific serial data a condition for executing the inspection program, a circuit failure, dew condensation, or a metal piece is generated. Solves the problem that the inspection program is erroneously executed due to the mixing of noise and external noise, and only uses one pin of the microcomputer, so it is necessary to add an expansion LSI even if the inspection program increases in number, for example. However, its practical value is enormous.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a combustion equipment control device showing an embodiment of the present invention. FIG. 2 is a block diagram in which a combustion device control device of the present invention is combined with an inspection device for executing various inspection programs and checking the combustion device control device. FIG. 3 is a flowchart for deciding whether to execute the inspection program or the sequence program when the power is turned on. FIG. 4 is a circuit block diagram of a conventional combustion device control device. 1 is a microcomputer, 7 is a memory element, 2 is a sequence program, 3 to 6 are various inspection programs, 8 is a drive circuit, 9 is a switch input circuit, 10 is a temperature measurement circuit, 11 is a flame detection circuit, 12 is a display device, 13 is a serial data receiving circuit, 14 is an inspection program execution input terminal of a microcomputer, 15 is an inspection program setting input terminal (E), 22 is an inspection program setting input terminal (F), 16 is an inspection program setting circuit, 17
Is a pseudo load circuit, 18 is a sensor having contacts, 19 is a thermistor, 20 is a pseudo flame detector, 21 is a serial data transmission circuit, 23 is the combustion equipment control device of the present invention, and 24 is an inspection for inspecting the combustion equipment control device. The devices, 25-31, are steps in the flow chart.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-107458 (JP, A) JP-A-62-155439 (JP, A) Actual development: JP-A-59-120343 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A combustion equipment control device for controlling combustion operation by a microcomputer, the microcomputer 1, a sequence program 2 for controlling the operation of the combustion equipment, and a plurality of inspection programs (A) for carrying out product shipment inspection. ) 3,
A storage element 7 in which (B) 4, (C) 5, and (D) 6 are stored,
A drive circuit 8 for driving various loads of the combustion device under the control of the microcomputer 1, a switch input circuit 9 connected to a sensor having a contact installed in various operation switches and the combustion device, and a temperature control device. A temperature measurement circuit 10 connected to the thermistor, a flame detection circuit 11 connected to a flame detector for monitoring the combustion state of the combustion equipment, a display device 12 for displaying the operating state of the combustion equipment, and a serial data reception circuit 13
By including the above, the microcomputer 1 decodes the serial data input to the serial data receiving circuit 13 when the power is turned on, and if the data is “1” among the predetermined data determined in advance, The inspection program (A) 3 is executed, and when it is “2”, the inspection program (B) 4 is executed, and when it is “3”, the inspection program (C) 5 is executed, If it is "4", the inspection program (D) 6 is executed, and if any of these predetermined data is not input, the normal sequence program is executed. Combustion equipment control device.