JP3060411B1 - Combustion control device - Google Patents

Abstract

[Abstract] [Problem] It is possible to save the labor of calibration performed by hand,
In addition, the calibration can be performed with high accuracy. The present invention relates to a combustion control device (1) for optimally controlling a hot water supply temperature, receiving an instruction from an automatic correction instruction means (1, 2) for instructing execution of an automatic correction mode, A valve opening command means 1 for outputting a predetermined valve opening to the fuel control valve 13, an expected temperature calculating means 1 for calculating an expected tapping temperature based on combustion under the valve opening, and an actual tapping Valve opening correction means 1 for correcting the valve opening when the temperature t1 is different from the expected tapping temperature by more than an allowable range; and valve opening when the actual tapping temperature t1 is within the allowable range with respect to the expected tapping temperature. And a valve opening storage means 1 for storing a degree of correction of the degree of fuel. In the normal combustion mode, the valve opening determined by referring to the amount of correction of the degree of valve opening stored by the degree of valve opening is stored in the fuel control. Controlling the valve 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control device for optimally controlling a hot water supply temperature in a water heater.

[0002]

2. Description of the Related Art In general, in a combustion apparatus, for example, a water heater, water is heated by a burner via a heat exchanger. The amount of combustion in the burner is controlled by the amount of fuel supplied to the burner. Is controlled by a proportional valve. In other words, the combustion control device (controller) controls the valve opening of the proportional valve in accordance with the amount of hot water (opening / closing of the faucet) and the hot water temperature requested by the user, thereby supplying water at a desired hot water temperature. In general, in the case of a combustion device shipped as a product, the valve opening instruction data of the proportional valve output by the controller is designed and output according to the required combustion amount at each time without depending on the individual product difference of the proportional valve. Is set as a constant.

By the way, each proportional valve does not always have the same valve opening even if it receives the same valve opening instruction data.
Rather, there is usually individual difference. Of course, there is no problem as long as the individual operation characteristics fall within the allowable range. Therefore, calibration is required to correct these errors.

Conventionally, this calibration (correction) is performed by setting a valve opening instruction from a controller to be constant at the time of maximum combustion and at the time of minimum combustion, respectively, so that the proportional valve control current at that time becomes a constant value, or when fuel is gaseous. In this case, calibration is performed so that the gas pressure becomes constant. As a calibration method, a semi-fixed resistor provided in the controller or an external controller such as an operation unit, a remote controller, or a personal computer is used to perform the calibration.

[0005]

However, as described above, if the calibration is performed by hand, the labor and time are required, and the calibration tends to be inaccurate. Furthermore, since it is not a direct calibration of the amount of combustion actually burning but an indirect calibration, errors are easily introduced into the calibration, and accurate calibration is difficult from this point as well.

[0006] The present invention has been proposed in view of the above,
It is an object of the present invention to provide a combustion control device that can save the labor of calibration (correction) performed by human hands and can perform calibration with high accuracy.

[0007]

In order to achieve the above object, a combustion control apparatus according to the present invention comprises an automatic correction command means for instructing execution of an automatic correction mode in a combustion control apparatus for optimally controlling a hot water supply temperature. Receiving a command from the automatic correction commanding means and outputting a predetermined valve opening to the fuel control valve; and an expected tapping temperature based on combustion under the predetermined valve opening. Expected temperature calculating means for calculating;
Valve opening correction means for correcting the valve opening when the actual tapping temperature is more than an allowable range with respect to the expected tapping temperature; and opening the valve when the actual tapping temperature is within an allowable range with respect to the expected tapping temperature. Valve opening storage means for storing a correction amount of the degree, the predetermined valve opening is the maximum valve that causes the maximum combustion
An opening and a minimum valve opening that causes a minimum combustion,
The valve opening storage means stores the correction amount for the maximum valve opening and the minimum valve opening.
The correction amount for the degree is stored in the normal combustion control mode.
Corresponds to the maximum valve opening stored in the valve opening storage means.
Read the correction amount to be corrected and the correction amount for the minimum valve opening,
A linear relational expression for the correction amount for the valve opening is determined.
The correction amount corresponding to the valve opening output by
Calculated by the correction amount obtained from the primary relational expression.
The fuel control valve is controlled according to the determined valve opening .

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the combustion control device of the present invention. 1, a combustion control device 1 according to the present invention includes a CPU, a ROM,
The system is configured around a microcomputer (microcomputer) including a RAM or the like, and controls the tapping temperature t of the tapping water from the water heater 10 to a desired temperature.

The water heater 10 is a device for boiling water supplied to a pipe 19 and supplying the water to a bathtub or a kitchen.
A heat exchanger 11 for supplying heat to water flowing through the heat exchanger, and a burner 12 for supplying heat energy to the heat exchanger 11 are provided. At the inlet side of the pipe 19, a water supply temperature sensor 16 for detecting the water temperature and a flow rate sensor 18 for detecting the amount of water supply are provided, and at the outlet side a hot water temperature sensor 17 for detecting the hot water temperature. . The burner 12 includes a fuel pipe 20 for supplying fuel and a fan motor 15 for supplying air required for combustion. The fuel pipe 20 includes an electromagnetic valve 14 that operates between two positions, open and closed, to supply and stop fuel, and a proportional valve 13 that adjusts the amount of supplied fuel according to the valve opening. Is provided.

The combustion control device 1 includes a water supply temperature sensor 16 of the water heater 10, a flow rate sensor 18, and a tap water temperature sensor 1.
7, the detection signals detected by the feed water temperature sensor 16, the flow rate sensor 18, and the tap water temperature sensor 17 are input. The proportional valve 13, the solenoid valve 14, and the fan motor 15 are connected to the combustion control device. 1 is the proportional valve 1
3. It outputs control signals to the solenoid valve 14 and the fan motor 15. Further, the combustion control device 1 is provided with an automatic correction start switch 2 for starting the automatic correction mode.

[0012] Combustion control device 1 and water heater 1 having the above configuration
0 is installed in a house or the like, and when the operator presses the automatic correction start switch 2 of the combustion control device 1, the CP of the combustion control device 1
U performs a predetermined automatic correction according to a program according to the present invention stored in the ROM in advance. The valve opening command means, the predicted temperature calculating means, the valve opening correcting means, the valve opening storing means, etc. in claim 1 of the present invention are configured as software functions executed by the CPU according to the program according to the present invention. ing.

When the automatic correction start switch 2 is depressed, the combustion control device 1 firstly sets a minimum valve opening degree set in advance in a design stage in order to perform combustion in the burner 12 with a minimum combustion amount. The instruction data is output to the proportional valve 13, and at the same time, water is supplied to the pipe 19, air is blown by the fan motor 15, and fuel is supplied to the fuel pipe 20. Further, the combustion amount Q in the burner 12 during this fixed time, that is, the amount of heat supplied to the water flowing through the pipe 19 via the heat exchanger 11 is represented by the valve opening degree instruction data to the proportional valve 13, the specific heat of fuel, The calculation is performed using the combustion time and the like, and the combustion amount Q, the supply water temperature t0 before heating detected by the supply water temperature sensor 16, and the supply water amount L detected by the flow rate sensor 18 are calculated.
Is used to calculate the expected tapping temperature ta according to the following equation (1).

Ta = Q / L + t0 (1)

The predicted tapping temperature ta is compared with the actual tapping temperature t1 detected by the tapping temperature sensor 17, and the difference between the predicted tapping temperature ta and the actual tapping temperature t1 is set within an allowable range (eg, ± 1). If it is within (° C.), the process proceeds to the next step without correcting the minimum valve opening instruction data, and if it exceeds the allowable range, the minimum valve opening instruction data is corrected as follows.

If the expected tapping temperature ta> the actual tapping temperature t1, it is determined that the actual valve opening is too small, the minimum valve opening instruction data is incremented, and the incremented minimum valve opening instruction data is output. The minimum combustion is performed again. Then, this procedure is performed by setting the difference between the expected tapping temperature ta and the actual tapping temperature t1 within an allowable range (for example, ± 1 ° C.).
It repeats until it is within the allowable range, and when it is within the allowable range, the increment amount for the first minimum valve opening instruction data is stored as a correction amount in an electrically rewritable nonvolatile memory (EEPROM).

On the other hand, if the expected tapping temperature ta <the actual tapping temperature t1, the actual valve opening is considered to be too large.
The minimum valve opening instruction data is decremented, the decremented minimum valve opening instruction data is output, and the minimum combustion is performed again. Then, this procedure is performed by setting the difference between the expected tapping temperature ta and the actual tapping temperature t1 within an allowable range (for example, ± 1
C)), and when it is within the allowable range, the amount of decrement for the first minimum valve opening instruction data is stored in the EEPROM as a correction amount.

Next, the combustion control device 1 outputs, to the proportional valve 13, maximum valve opening degree instruction data set in a design stage in advance so that the combustion in the burner 12 is performed at the maximum combustion amount, and the maximum combustion is performed. Is performed, and the expected tapping temperature ta is obtained in the same manner as in the case of the minimum combustion described above, and is compared with the actual tapping temperature t1. Then, the expected tapping temperature ta and the actual tapping temperature t
The increment amount and the decrement amount when the difference from 1 is within the allowable range are stored in the EEPROM as correction amounts. After determining and storing the correction amount, the automatic correction is completed.

It is to be noted that the above-mentioned correction amounts are preferably stored in the EEPROM at a plurality of locations, and each of them is added with a code correction bit in accordance with a known well-known code correction theory. If any one of the data is damaged, it is preferable that the data can be repaired by using other correct data.

In a normal combustion control mode, an EEPROM
The new valve opening instruction data is determined by referring to the correction amount of the valve opening stored in. That is, the above-mentioned correction amount stored in the EEPROM is read out to determine a linear relational expression of the correction amount with respect to the valve opening degree. The correction amount to be performed is obtained from the linear relational expression, and the correction amount obtained from the linear relational expression is added to the valve opening instruction data and output to the proportional valve 13. Then, the water supply to the pipe 19 and the fan motor 15
To supply fuel to the fuel pipe 20 and perform normal combustion control.

As described above, in this embodiment, the correction amount of the valve opening instruction data for the proportional valve 13 is automatically obtained only by pressing the automatic correction start switch 2, so that it is manually operated. Correction can be quickly performed in a short time without performing the correction, and the correction can be performed with high accuracy because the correction is performed without manual operation.

In the above description, the automatic correction start switch 2
Is pressed, the automatic correction is executed. However, instead of using the automatic correction start switch 2, for example, a specific combination that is not used in the normal combustion control mode is used to operate an operation button, a remote control, or the like, and receive the operation. May be configured to execute automatic correction.

[0023]

As described above, according to the combustion control apparatus of the present invention, the correction amount of the valve opening for the fuel control valve is automatically determined in response to the instruction to execute the automatic correction mode. Therefore, the correction can be performed quickly in a short time without the need for manual operation, and the correction can be performed with high accuracy because the correction is performed without manual operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a combustion control device and a water heater according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion control apparatus 2 Automatic correction start switch 10 Water heater 11 Heat exchanger 12 Burner 13 Proportional valve 14 Solenoid valve 15 Fan motor 16 Feed water temperature sensor 17 Hot water temperature sensor 18 Flow rate sensor 19 Pipe 20 Fuel pipe

Claims (3)

(57) [Claims] 1. A combustion control device for optimally controlling a hot water supply temperature, comprising: an automatic correction command means for instructing execution of an automatic correction mode; Valve opening command means for outputting a valve opening degree, predicted temperature calculating means for calculating an expected tapping temperature based on combustion under the predetermined valve opening degree, and an actual tapping temperature allowed for the expected tapping temperature. Valve opening correction means for correcting the valve opening when the difference differs by more than the range, and valve opening storage means for storing a correction amount of the valve opening when the actual tapping temperature is within an allowable range with respect to the expected tapping temperature. And the predetermined valve opening is the maximum valve opening that causes the maximum combustion.
And the minimum valve opening that causes the minimum combustion.
The degree storage means stores the correction amount for the maximum valve opening and the minimum valve opening
And in the normal combustion control mode, the valve opening storage means stores the correction amount.
Of the maximum valve opening and the minimum valve opening
Read out the correction amount and find the linear relationship of the correction amount to the valve opening.
Determines the formula and corrects for the valve opening output at each time
Calculate the quantity from its linear relation and then from its linear relation
Control the fuel control valve to the valve opening obtained by the correction
To control, combustion control apparatus characterized by. 2. The water supply temperature sensor according to claim 1, wherein
The feedwater temperature before heating detected by the
Formula using the supplied water supply amount: Expected hot water temperature = (combustion amount / supply
Calculate according to the amount of water) + supply water temperature, The combustion control device according to claim 1, wherein: 3. The automatic correction commanding means according to claim 1, wherein said automatic correction command means starts automatic correction.
Start by pressing the switch, The combustion control device according to claim 1, wherein: