JPH11237039A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a time necessary for the adjusting work of amount of supplying electric power by a method wherein the detecting value of secondary pressure of an electromagnetic proportional valve is compared with a predetermined value by a microcomputer while the amount of supplying electric power of the electromagnetic proportional valve is adjusted so that the detecting value of secondary pressure coincides with the predetermined value to determine a control data and write the same into a memory means. SOLUTION: A microcomputer 9 compares the detecting value of secondary pressure of an electromagnetic proportional valve 4 through a gas pressure gauge 6 with a predetermined value, stored and retained previously, through a comparing means 15 and adjusts the supplying current value (the commanding value of a current given to a proportional valve driving circuit 10) of the electromagnetic proportional valve 4 through an adjusting means 16 in accordance with the result of comparison. Then, a control data, determined by the result of adjusting, is stored and retained in an EEPROM 11 through a writing means 17. According to this method, the adjusting work of the amount of supplying electric power to the electromagnetic proportional valve 4 can be effected efficiently within a short period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a gas hot air heater,
The present invention relates to a combustion device such as a gas water heater.

[0002]

2. Description of the Related Art In a combustion apparatus of this kind, an electromagnetic proportional valve for generating a secondary pressure proportional to the amount of electric current is provided in a gas supply path to a burner, and the amount of electric current supplied to the electromagnetic proportional valve is controlled by a microcomputer or the like. In this regard, it is generally known that the secondary pressure of the proportional solenoid valve (gas pressure on the downstream side of the proportional solenoid valve) is controlled. In this case, the amount of gas supplied to the burner and the amount of combustion of the burner are determined by the secondary pressure generated by the solenoid proportional valve. The gas supply amount and the burner combustion amount are controlled. Then, from the target combustion amount of the burner (this corresponds to the gas supply amount to the burner or the target value of the secondary pressure of the electromagnetic proportional valve), the electromagnetic energy is calculated based on control data such as a predetermined data table or an arithmetic expression. By determining the amount of electricity to the proportional valve and energizing the solenoid proportional valve according to the determined amount of electricity, the secondary pressure of the solenoid proportional valve is adjusted to the secondary pressure corresponding to the target combustion amount (target gas supply amount) of the burner. To control.

[0003] As described above, in the case of a combustion device having an electromagnetic proportional valve, when individual products are compared, due to variations in manufacturing accuracy or operating characteristics of the electromagnetic proportional valve to be assembled in each combustion device, etc. Even if the amount of electricity supplied to the electromagnetic proportional valve of each combustion device is the same, the secondary pressure of the electromagnetic proportional valve of each combustion device varies. For this reason, in each combustion device,
For example, even if the energization amount of the proportional solenoid valve is determined uniformly according to the target combustion amount (target gas supply amount) of the burner, the actual secondary pressure of the proportional solenoid valve is determined for each product of the combustion device. Variations occur, which makes it difficult to accurately control the actual combustion amount of the burner to the target combustion amount.

In order to solve such inconveniences, in a combustion plant or the like, it is common practice to adjust the amount of power supplied to the electromagnetic proportional valve for each product of the combustion device.
As a method for performing such an adjustment, a method disclosed in, for example, Japanese Patent No. 2639201 is conventionally known.

The device disclosed in the above publication uses gas pressure detecting means for detecting the secondary pressure of an electromagnetic proportional valve of a combustion device, and an external controller for adjustment different from the combustion device to control each combustion device. This is for adjusting the amount of current supplied to the electromagnetic proportional valve, and this adjustment is performed as follows.

That is, the gas pressure detecting means is connected to the secondary pressure detecting port of the proportional solenoid valve to detect the secondary pressure of the proportional solenoid valve, and inputs the detected data to the external controller for adjustment. In the external controller for adjustment, predetermined maximum and minimum values of the secondary pressure of the electromagnetic proportional valve corresponding to the maximum combustion amount and the minimum combustion amount of the combustion device are set in advance. Then, the adjusting external controller first compares the detected value of the secondary pressure by the gas pressure detecting means with the predetermined minimum value, and sequentially outputs data indicating the comparison result.
This is given to the main controller by serial communication with the main controller provided in the combustion device.

On the other hand, in the main body controller of the combustion device,
Until the data of the comparison result given from the external controller for adjustment becomes the data indicating the coincidence between the detected value of the secondary pressure and the predetermined minimum value, the amount of electricity supplied to the solenoid proportional valve (more specifically, the The control output of the main body controller that regulates the minimum amount of current is adjusted successively. Then, the control output of the main controller when data indicating the coincidence between the detected value of the secondary pressure and the predetermined minimum value is given from the external controller for adjustment is used as the amount of current supplied to the minimum side of the proportional solenoid valve (the proportional solenoid valve). Is stored in non-volatile storage means provided in the main body controller as control data for defining the amount of energization at which the secondary pressure becomes a predetermined minimum value.

Next, in the same manner as above, the controller controller compares the detected value of the secondary pressure with the predetermined maximum value, and, in the main controller, determines the amount of current supplied to the solenoid proportional valve (more specifically, The control output of the main controller that regulates the maximum energization amount of the solenoid proportional valve is sequentially adjusted, and the control output of the main controller when the detected value of the secondary pressure matches the predetermined maximum value is changed to the solenoid proportional valve. Is stored in non-volatile storage means of the main body controller as control data for defining the maximum amount of current (the amount of current at which the secondary pressure of the electromagnetic proportional valve becomes a predetermined maximum value).

In the combustion apparatus in which the amount of energization is adjusted in this way, the main controller controls the solenoid proportional valve between the minimum amount of energization and the maximum amount of energization determined by the control data. Is controlled. At this time, when the electromagnetic proportional valve is energized with the minimum energizing amount, the secondary pressure of the electromagnetic proportional valve becomes a predetermined minimum value corresponding to the minimum combustion amount of the combustion device, and energized with the maximum energizing amount. At this time, the secondary pressure of the electromagnetic proportional valve becomes a predetermined maximum value corresponding to the maximum combustion amount of the combustion device. Therefore, by controlling the amount of current supplied to the electromagnetic proportional valve between the minimum amount of current and the maximum amount of current, the secondary pressure of the electromagnetic proportional valve is reduced to the target combustion amount (target gas supply Amount) can be appropriately controlled to the secondary pressure corresponding to the amount.

However, in the technique for adjusting the amount of current supplied to the electromagnetic proportional valve, data indicating the result of comparison between the detected value of the secondary pressure by the gas pressure detecting means and a predetermined value (minimum value or maximum value) is used for adjustment. Since the external controller gives the main controller of the combustion device by communication between the two controllers, it takes a long time for the adjustment work. That is, when the data of the comparison result given from the external controller for adjustment indicates that the detected value of the secondary pressure does not match the predetermined value, the main controller increases or decreases the secondary pressure. The amount of energization of the solenoid proportional valve is adjusted.This adjustment determines whether the detected value of the secondary pressure matches the predetermined value. It is unknown until the data of the comparison result is received. After the adjustment of the energization amount, it takes a certain amount of time (for example, 0.5 seconds) until the data of the comparison result corresponding to the adjustment is transmitted from the external controller for adjustment. Therefore, each time the main controller adjusts the energization amount of the electromagnetic proportional valve, it is necessary to wait until the data of the comparison result by the adjustment is transmitted from the external controller for adjustment. It takes a long time until the amount of energization is finally adjusted to the amount of energization such that the detected value of the secondary pressure matches the predetermined value.

In addition, the above-described adjustment technique requires an external controller for adjustment different from the main controller of the combustion apparatus, and both controllers also require a communication circuit for performing communication between them. As a result, it was disadvantageous in terms of cost.

[0012]

SUMMARY OF THE INVENTION In view of the above background, the present invention enables efficient adjustment of the amount of current supplied to an electromagnetic proportional valve in a short period of time and an inexpensive and simple system for the adjustment. It is an object of the present invention to provide a combustion device that can perform the following.

[0013]

In order to achieve the above object, a combustion apparatus according to the present invention achieves the above object by controlling an electromagnetic proportional valve provided in a gas supply path to a burner, and controlling the amount of electricity supplied to the electromagnetic proportional valve. A microcomputer that controls a secondary pressure of the electromagnetic proportional valve that regulates a gas supply amount to the burner, and an energization amount of the electromagnetic proportional valve at which a secondary pressure of the electromagnetic proportional valve becomes a predetermined value. Storage means for storing and holding the control data of the microcomputer that defines the control means, wherein the microcomputer controls the amount of electricity to the electromagnetic proportional valve based on the control data stored and held in the storage means. A connecting portion for detachably connecting a gas pressure detecting means external to the combustion device, and applying a secondary pressure of the electromagnetic proportional valve to the gas pressure detecting means in the connected state; A signal input unit for inputting a detection signal of the gas pressure detection means connected to the microcomputer to the microcomputer, wherein the microcomputer detects a detection value of a secondary pressure of the electromagnetic proportional valve by the gas pressure detection means and Comparing means for comparing a predetermined value, and adjusting means for adjusting the energization amount of the electromagnetic proportional valve so that the detected value of the secondary pressure matches the predetermined value based on the comparison result of the comparing means, A writing unit that determines the control data based on the adjusted energization amount and writes the determined control data in the storage unit.

According to the present invention, when adjusting the amount of energization of the electromagnetic proportional valve, the gas pressure detecting means is connected to the connection portion, and the detection signal of the gas pressure detecting means is transmitted via a lead wire or the like. (The detection signal is input to the microcomputer). In this state, the microcomputer of the combustion device uses the comparison means and the adjustment means provided therein to determine the secondary pressure detected value of the electromagnetic proportional valve indicated by the detection signal of the gas pressure detection means and the predetermined value. While comparing with the predetermined value,
The energization amount of the solenoid proportional valve is adjusted so that they match. Then, the microcomputer determines the control data of the microcomputer that regulates the amount of energization based on the amount of energization of the electromagnetic proportional valve that is adjusted so that the detected value of the secondary pressure matches the predetermined value. The writing means writes and stores the data in the storage means. During the actual operation of the combustion device, the microcomputer controls the amount of current supplied to the electromagnetic proportional valve based on the control data stored and stored in the storage means as described above. The amount of gas supplied to the burner is controlled. At this time, for example, by energizing the electromagnetic proportional valve with an energizing amount defined by the control data, that is, an energizing amount adjusted so that the detected value of the secondary pressure and the predetermined value match during the previous adjustment. The secondary pressure of the proportional solenoid valve is controlled to the predetermined value.

According to the present invention, when adjusting the energization amount of the electromagnetic proportional valve, the comparison between the detected value of the secondary pressure and the predetermined value, and the adjustment of the energization amount according to the comparison result are performed by the combustion. The detection is performed in the internal processing of the microcomputer of the apparatus, and the detected value of the secondary pressure is directly input to the microcomputer from the gas pressure detecting means. For this reason, the microcomputer can perform the above-mentioned comparison and adjustment processes almost simultaneously, and as a result, these processes can be performed quickly in a short time.

By providing the comparing means and the adjusting means in an existing microcomputer in the combustion apparatus, the processing of those means can be performed by software processing. As a result, in order to adjust the energization amount of the solenoid proportional valve,
It is possible to adjust the amount of power to the solenoid proportional valve simply by connecting the gas pressure detection means to the combustion device without installing a special electronic unit on the combustion device or using a control unit separate from the combustion device. It can be carried out.

Therefore, according to the present invention, the work of adjusting the amount of current supplied to the electromagnetic proportional valve can be performed efficiently in a short time, and the system for the adjustment can be made inexpensive and simple.

In the present invention, more specifically, the predetermined value of the secondary pressure is determined by the electromagnetic force that defines the maximum gas supply amount and the minimum gas supply amount to the burner during the combustion operation of the burner. The control data written to the storage means by the writing means is the maximum value and the minimum value of the secondary pressure of the proportional valve, and the detection value of the secondary pressure matches the maximum value by the adjusting means. And the data indicating the amount of energization adjusted so that the detected value of the secondary pressure matches the minimum value.

As described above, the data indicating the amount of energization at which the secondary pressure of the proportional solenoid valve becomes the maximum value corresponding to the maximum gas supply amount (maximum combustion amount) of the burner, and the secondary pressure is the minimum gas supply amount of the burner By causing the storage means to store and hold data indicating the amount of energization corresponding to the minimum value corresponding to (minimum combustion amount) as the control data, the microcomputer determines whether the secondary pressure between the maximum value and the minimum value The appropriate energization amount of the electromagnetic proportional valve corresponding to an arbitrary secondary pressure can be proportionally determined from the energization amount data stored in the storage means corresponding to the maximum value and the minimum value of the secondary pressure, respectively. It becomes possible. For this reason, it becomes possible to control the secondary pressure of the electromagnetic proportional valve to a desired secondary pressure between the minimum value and the maximum value, and thus to accurately control the gas supply amount or the combustion amount of the burner to a desired amount. It becomes possible to control.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram showing a system configuration of a main part of the combustion device of the present embodiment, and FIG. 2 is a diagram for explaining an operation of the combustion device of FIG.

Referring to FIG. 1, a combustion apparatus 1 according to the present embodiment is shown.
Is a gas hot air heater, for example, and includes an electromagnetic proportional valve 4 interposed in a gas supply path 3 to the burner 2 and a control unit 5 for controlling the operation of the combustion device 1 and the like.

It should be noted that, in addition to these structures, a blower fan for supplying combustion air to the burner 2 while convection of room air,
Although an electromagnetic valve for opening and closing the gas supply path 3 is also provided,
Illustration and explanation of these are omitted.

The electromagnetic proportional valve 4 controls the pressure of the gas flowing through the burner 2 on the downstream side, that is, the secondary pressure to a pressure proportional to the amount of current (current value) supplied to the electromagnetic proportional valve 4. It is. The gas supply amount to the burner 2 and the burner 2
Is determined by the magnitude of the secondary pressure generated by the electromagnetic proportional valve 4, and is proportional to the secondary pressure.

Further, a gas pressure gauge 6 (gas pressure detecting means) for detecting a secondary pressure generated by the electromagnetic proportional valve 4 is connected to the electromagnetic proportional valve 4 via a conductive pipe 7 such as a hose at the time of adjustment described later. A connecting portion 8 for detachably connecting is provided, so that the secondary pressure generated by the electromagnetic proportional valve 4 can be applied to the gas pressure gauge 6 from the connecting portion 8 via the conduit 7.
Note that the connection portion 8 is normally closed by a member such as a screw.

The control unit 5 includes a C (not shown)
A microcomputer 9 comprising a PU, a RAM, a ROM, and the like (hereinafter referred to as a microcomputer 9), a proportional valve driving circuit 10 for energizing the electromagnetic proportional valve 4 in accordance with a command from the microcomputer 9, and an electromagnetic proportional valve 4 EEPRO for storing and holding the control data described later necessary for the energization control of
M11 (non-volatile storage means). still,
The command given from the microcomputer 9 to the proportional valve drive circuit 10 when the electromagnetic proportional valve 4 is energized is a command value (more precisely, a pulse signal representing the command value) of the current supplied to the electromagnetic proportional valve 4. The proportional valve drive circuit 10 is configured using a constant current circuit, and supplies a current of a command value given from the microcomputer 9 to the electromagnetic proportional valve 4.

The control unit 5 has a signal line 12 derived from the gas pressure gauge 6 for inputting a detection signal (detected value of the secondary pressure of the electromagnetic proportional valve 4) of the gas pressure gauge 6 to the microcomputer 9. And a mode setting switch 14 for setting the operation mode of the microcomputer 9
Are provided.

In this case, the operation mode of the microcomputer 9 set by the mode setting switch 14 includes a normal operation mode and an adjustment mode. Although details of the operation in these modes will be described later, the normal operation mode is a mode for performing a normal operation (heating operation) of the combustion device 1 (hot air heater). 9 is
A command value of a current to be supplied to the electromagnetic proportional valve 4 for causing the electromagnetic proportional valve 4 to generate a secondary pressure corresponding to a target combustion amount (burning speed) of the burner 2 is stored and retained in the EEPROM 11 as described later. Control data, data previously stored in a ROM (mask ROM) (not shown) of the microcomputer 9, an arithmetic expression, and the like, and the determined current command value is given to the proportional valve drive circuit 10. The electromagnetic proportional valve 4 is energized and controlled through the proportional valve drive circuit 10.

In the adjustment mode, the secondary pressure of the solenoid proportional valve 4 detected by using the gas pressure gauge 6 is compared with a predetermined value stored in the ROM of the microcomputer 9 for each combustion device 1. While the current flowing through the electromagnetic proportional valve 4 (current command value from the microcomputer 9 to the proportional valve drive circuit 10)
Is adjusted, and EEPRO is adjusted according to the adjustment result.
The control data to be stored and held in M11 is determined and
This is a mode in which a process of writing to the PROM 11 is performed. Then, in order to perform the processing in this adjustment mode, the microcomputer 9
Is a comparison means 15 for comparing the detected value of the secondary pressure by the gas pressure gauge 6 with a predetermined value, and a current value of the current supplied to the electromagnetic proportional valve 4 (a current instruction value given to the proportional valve drive circuit 10) according to the comparison result. And a writing unit 17 for storing control data determined by the adjustment result in the EEPROM 11 as a functional configuration by software.

Here, for the sake of convenience in the following description, data stored in advance in the ROM of the microcomputer 9 will be described with reference to FIG. In the present embodiment, the ROM of the microcomputer 9 stores the minimum combustion amount Qmin of the burner 2 which is predetermined according to the model of the combustion device 1 and the like.
The minimum value Pmin of the secondary pressure corresponding to (hereinafter, the minimum secondary pressure P
min), which represents a standard value I0min (hereinafter referred to as a minimum standard current value I0min) of a current to be supplied to the electromagnetic proportional valve 4 in order to cause the electromagnetic proportional valve 4 to generate the burner 2.
Maximum value Pmax of the secondary pressure corresponding to the maximum combustion amount Qmax
The data representing the standard value I0max (hereinafter referred to as the maximum standard current value I0max) of the current to be supplied to the electromagnetic proportional valve 4 in order to cause the electromagnetic proportional valve 4 to generate the maximum secondary pressure Pmax (hereinafter referred to as maximum secondary pressure Pmax). It is stored and held in advance. further,
Data representing the values of the minimum secondary pressure Pmin and the maximum secondary pressure Pmax is stored and held in the ROM of the microcomputer 9 in advance. These data are common to the combustion devices 1 having the same model and the like. It should be noted that these data are obtained for each combustion device 1 before the adjustment described below is performed.
You may make it memorize | store and hold in EPROM11.

Next, the operation of the combustion device 1 of the present embodiment will be described in detail.

In the combustion apparatus 1 of the present embodiment, the processing in the adjustment mode is executed for each of the combustion apparatuses 1 at the production factory or the like.

That is, in order to detect the secondary pressure generated when the electromagnetic proportional valve 4 is energized, the gas pressure gauge 6 is connected to the connecting portion 8 of the electromagnetic proportional valve 4 through the conduction pipe 7. The detection signal of the gas pressure gauge 6 is transmitted to the microcomputer 9 of the combustion device 1.
The gas pressure gauge 6 is connected to the signal input unit 13 of the control unit 5
Connected to. The mode setting switch 14 of the control unit 5 is set to the adjustment mode. Further, gas is supplied to the gas supply path 3 from the upstream side of the proportional solenoid valve 4.

In such a state, the microcomputer 9 firstly controls the minimum standard current value I0m by the adjusting means 16.
is supplied to the proportional valve drive circuit 10 as a current command value, and the current of the command value is supplied to the electromagnetic proportional valve 4. At this time, the secondary pressure generated by the electromagnetic proportional valve 4 due to the energization is supplied to the gas pressure gauge 6 from the connection portion 8 via the conduit 7 and detected. Then, a signal indicating the detected value of the secondary pressure is input from the gas pressure gauge 6 to the microcomputer 9 via the signal line 12 and the signal input unit 13, and the microcomputer 9 converts the input detected value of the secondary pressure into a signal. The comparison is made by the comparing means 15 with the minimum secondary pressure Pmin.

In this case, the minimum standard current value I0min which is first energized to the electromagnetic proportional valve 4 is, as described above, the minimum secondary pressure P0.
min is generated by the electromagnetic proportional valve 4.
Is the standard value of the current to be supplied to the gas pressure gauge 6
Is the minimum secondary pressure Pmin.
However, in many cases, it does not completely match the minimum secondary pressure Pmin due to manufacturing or characteristics variations of the electromagnetic proportional valves 4 of the individual combustion devices 1.

In such a case, the microcomputer 9
Of the proportional valve drive circuit 10 so that the detected value of the secondary pressure by the gas pressure gauge 6 coincides with the minimum secondary pressure Pmin.
The current command value to be supplied to the electromagnetic proportional valve 4 is changed from the minimum standard current value I0min. Specifically, when the detected value of the secondary pressure is larger than the minimum secondary pressure Pmin, the current command value given to the proportional valve drive circuit 10 is gradually reduced from the minimum standard current value I0min (electromagnetic The secondary pressure generated by the proportional valve 4 is gradually reduced. Conversely, if the detected value of the secondary pressure is smaller than the minimum secondary pressure Pmin, the current command value given to the proportional valve drive circuit 10 Is gradually increased from the minimum standard current value I0min (the secondary pressure generated by the electromagnetic proportional valve 4 is gradually increased). And finally, the detected value of the secondary pressure is the minimum secondary pressure P
When the value coincides with min, the change of the current command value given to the proportional valve drive circuit 10 is stopped, and the current command value is held.

When the secondary pressure detected by the gas pressure gauge 6 thus matches the minimum secondary pressure Pmin, the writing means 17 of the microcomputer 9 sets the current command value Imin (see FIG. 2; hereinafter, refer to FIG. 2). Deviation δmin (= Imin−I) between the minimum actual current command value Imin) and the minimum standard current value I0min.
0min), that is, the correction amount δmin of the minimum actual current command value Imin from the minimum standard current value I0min is determined by the electromagnetic proportional valve 4.
As the data (control data for defining the current flow) indicating the current flow (current flow) of the electromagnetic proportional valve 4 whose secondary pressure becomes the minimum secondary pressure Pmin corresponding to the minimum combustion volume Qmin of the burner 4, Write to. In other words, the energization amount of the solenoid proportional valve 4 is such that the secondary pressure of the solenoid proportional valve 4 becomes the minimum secondary pressure Pmin corresponding to the minimum combustion amount Qmin of the burner 4, and the detected secondary pressure is the minimum secondary pressure. Pmin is the current value of the minimum actual current command value Imin at the time of coincidence with Pmin.
The command value Imin is obtained by adding the correction amount δmin (hereinafter referred to as the minimum current correction amount δmin) written in the EEPROM 11 to a predetermined minimum standard current value I0min. Therefore, in the present embodiment, the minimum current correction amount δmin determined as described above is
Is written in the EEPROM 11 as control data for defining the amount of current supplied to the electromagnetic proportional valve 4 at which the secondary pressure becomes the minimum secondary pressure Pmin corresponding to the minimum combustion amount Qmin of the burner 4.

In this manner, the minimum current correction amount δ
After determining min and storing it in the EEPROM 11,
The adjusting means 16 of the microcomputer 8 then gives the maximum standard current value I0max as a current command value to the proportional valve drive circuit 10 while the gas pressure gauge 6 is connected to the connection unit 8 and the signal input unit 13, The current of the command value is supplied to the electromagnetic proportional valve 4.

Then, in the same manner as described above, the microcomputer 9 uses the comparing means 15 to detect the detected value of the secondary pressure of the electromagnetic proportional valve 4 by the gas pressure gauge 6 and the maximum combustion amount Qma of the burner 2.
While comparing the maximum secondary pressure Pmax corresponding to x, the current command value given to the proportional valve drive circuit 10 is adjusted by the adjusting means 16 until they match, and is changed from the maximum standard current value I0max. Further, the current command value Imax when the detected value of the secondary pressure matches the maximum secondary pressure Pmax (FIG. 2)
reference. Hereinafter, a deviation δmax (= Imax−) between the maximum-side actual current command value Imax) and the maximum-side standard current value I0max.
I0max), that is, the correction amount δmax of the maximum actual current command value Imax from the maximum standard current value I0max (hereinafter referred to as the maximum current correction amount δmax) is determined by the secondary pressure of the electromagnetic proportional valve 4 Maximum secondary pressure Pma corresponding to combustion amount Qmax
EEP is used as data (control data defining the current flow) indicating the current flow (current flow) of the electromagnetic proportional valve 4,
Write to ROM11.

Thus, the minimum current correction amount δmin
And the data of the maximum current correction amount δmax
After writing to 1, the gas supply to the gas supply path 3 is stopped, and the gas pressure gauge 6 is removed from the combustion device 1;
Further, the mode setting switch 14 is set to the normal operation mode. After that, the combustion device 1 is shipped as a product through various processes.

In the present embodiment, the adjustment relating to the minimum secondary pressure Pmin is performed before the adjustment relating to the maximum secondary pressure Pmax, but the former may be performed after the latter. Good.

On the other hand, in the operation in the normal operation mode (normal heating operation) of the combustion device 1 in which the control data is stored and held in the EEPROM 11 as described above, the microcomputer 9 is used.
Basically controls the current supplied to the electromagnetic proportional valve 3 via the proportional valve drive circuit 10 as follows.

That is, in the normal operation mode, the microcomputer 9 determines the amount of combustion of the burner 2 during operation of the combustion device 1 based on a room temperature detected by a room temperature sensor (not shown) or a set room temperature specified by the user. (Target value of gas supply amount) is determined. Further, in order to cause the electromagnetic proportional valve 4 to generate a secondary pressure corresponding to the target combustion amount, a command value of a current to be supplied to the electromagnetic proportional valve 4 is set to EEP.
Control data stored in the ROM 11 (data of the minimum current correction amount δmin and the maximum current correction amount δmax)
Alternatively, it is determined based on the data of the minimum standard current value I0min and the maximum standard current value I0max stored in advance in a ROM (mask ROM) of the microcomputer 9 and the determined current command value is proportional valve drive. To the circuit 10.

More specifically, referring to FIG.
Is the minimum-side standard current value I0min and the minimum-side current correction amount δmin
And the minimum actual current command value Imin (the energizing current value at which the secondary pressure of the proportional solenoid valve 4 becomes the minimum secondary pressure Pmin);
From the maximum actual current command value Imax (the current value at which the secondary pressure of the proportional solenoid valve 4 becomes the maximum secondary pressure Pmax) obtained by adding the maximum current correction amount δmax to the maximum standard current value I0max,
As shown by a solid line in FIG. 2, an equation of a straight line a representing the relationship between the combustion amount of the burner 2 and the current command value of the electromagnetic proportional valve 4 is obtained. Then, as described above, the target combustion amount Qx (Qmin ≦ Qx ≦ Qma
When x) is determined, a command value Ix of a current to be supplied to the electromagnetic proportional valve 4 is determined by a formula of a straight line a corresponding to the target combustion amount Qx, and is given to the proportional valve drive circuit 10.

In other words, the microcomputer 9 calculates the minimum combustion amount Q
The current command value Ix corresponding to an arbitrary target combustion amount Qx between the minimum combustion amount Qmax and the minimum combustion amount Qmi
n is determined proportionally from the minimum actual current command value Imin corresponding to n and the maximum actual current command value Imax corresponding to the maximum combustion amount Qmax, and is given to the proportional valve drive circuit 10.

In this case, the minimum actual current command value Imin defined by the data of the minimum current correction amount δmin
The electromagnetic proportional valve 4 in which the secondary pressure of the electromagnetic proportional valve 4 accurately becomes the minimum secondary pressure Pmin corresponding to the minimum combustion amount Qx as described above.
Similarly, the maximum current correction amount δmax
The maximum actual current command value I defined by the data
max indicates that the secondary pressure of the proportional solenoid valve 4 is exactly the maximum combustion amount Qx
Is the current flowing through the electromagnetic proportional valve 4 at which the maximum secondary pressure Pmax is obtained. Therefore, by determining the current command value of the electromagnetic proportional valve 4 corresponding to the target combustion amount Qx of the burner 2 as described above, the secondary pressure actually generated by the electromagnetic proportional valve 4 is reliably converted to the target combustion amount Qx. The corresponding secondary pressure can be controlled. As a result, the gas corresponding to the target combustion amount Qx is reliably supplied to the burner 2, and the burner 2 can be burned with the target combustion amount Qx with high accuracy.

According to the combustion apparatus of the present embodiment described above, in the adjustment process in the adjustment mode, the detected value of the secondary pressure of the electromagnetic proportional valve 4 by the gas pressure gauge 6 is used.
The microcomputer 9 inputs the detected value directly to a predetermined value (minimum secondary pressure Pmin or Pmax).
), And according to the comparison result, the electromagnetic proportional valve 4
The microcomputer 9 can adjust the current command value and compare the detected value appearing as a result of the adjustment with a predetermined value almost simultaneously. For this reason, the microcomputer 9 can quickly and quickly adjust the current command value so that the detected value of the secondary pressure matches the predetermined value.

Further, the process of comparing the detected value of the secondary pressure with the predetermined value in the microcomputer 9 and the process of adjusting the current command value according to the result can be performed by the software of the microcomputer 9. It is not necessary to newly provide a special circuit unit for performing such adjustment in the combustion device 1, and therefore, the adjustment operation can be performed with an inexpensive system.

In this embodiment, the control data stored in the EEPROM 11 includes a minimum current correction amount δmin that defines the minimum actual current command value Imin, and a maximum current value that defines the maximum actual current command value Imax. Side current correction amount δ
However, the data of the minimum-side actual current command value Imin and the maximum-side actual current command value Imax may be stored and held in the EEPROM 11 as control data. The equation of the straight line a in FIG. 2 determined by the value Imin and the maximum-side actual current command value Imax may be stored in the EEPROM 11 as control data.

In the present embodiment, the adjustment mode is set by the mode setting switch 14 provided in the control unit 5, so that the microcomputer 9 performs the process of adjusting the current of the solenoid proportional valve 4 as described above. Alternatively, an appropriate command signal may be supplied to the microcomputer 9 from outside the combustion device 1 to cause the microcomputer 9 to perform a current adjustment process.

Further, in the present embodiment, a gas hot air heater has been described as an example of the combustion device 1, but the present invention can of course be applied to a combustion device such as a gas water heater.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a system configuration of a main part of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the combustion device of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Combustion device, 2 ... Burner, 3 ... Gas supply path, 4 ... Electromagnetic proportional valve, 6 ... Gas pressure gauge (gas pressure detecting means), 8 ... Connection part, 9 ... Microcomputer, 11 ... EEPROM
(Storage means), 13 ... signal input section, 15 ... comparison means, 1
6 adjustment means, 17 writing means.

Claims (2)

[Claims] An electromagnetic proportional valve provided in a gas supply path to a burner, and a secondary pressure of the electromagnetic proportional valve that regulates a gas supply amount to the burner by controlling an amount of electricity supplied to the electromagnetic proportional valve. A microcomputer that controls the microcomputer, and a storage unit that stores and holds control data of the microcomputer that regulates the amount of energization of the electromagnetic proportional valve at which the secondary pressure of the electromagnetic proportional valve becomes a predetermined value. The microcomputer is configured to control the amount of electricity supplied to the electromagnetic proportional valve based on the control data stored and held in the storage means. The microcomputer is provided so that gas pressure detection means external to the combustion apparatus can be detachably connected. A connecting part for applying the secondary pressure of the proportional solenoid valve to the gas pressure detecting means in the connected state, and a detection signal of the gas pressure detecting means connected to the connecting part to the micro computer. A signal input unit for inputting the signal to a computer, wherein the microcomputer compares a detection value of a secondary pressure of the electromagnetic proportional valve by the gas pressure detection unit with the predetermined value, and a comparison of the comparison unit. Adjusting means for adjusting the amount of energization of the electromagnetic proportional valve so that the detected value of the secondary pressure matches the predetermined value based on the result; and the storage means for determining the control data based on the adjusted amount of energization. And a writing means for writing to the combustion device. 2. The predetermined value of the secondary pressure is a maximum value of a secondary pressure of the solenoid proportional valve which defines a maximum gas supply amount and a minimum gas supply amount to the burner during the combustion operation of the burner. And the minimum value, and the control data written to the storage means by the writing means is the energization amount adjusted by the adjusting means so that the detected value of the secondary pressure coincides with the maximum value. 2. The combustion apparatus according to claim 1, wherein the data indicates the amount of energization adjusted so that the detected value of the secondary pressure matches the minimum value. 3.