KR960004216B1 - Control unit for combustor - Google Patents

Abstract

The apparatus comprises an operation equation producing unit for producing a control operation equation in a control operating unit based on a plurality of burning information and a plurality of control value information corresponding to the plurality of burning information, the plurality of burning information being produced based on the maximum or minimum amount in the burning, and also based on the maximum or minimum number of rotations of a pan.

Description

Combustion control device

1 is a schematic configuration diagram of a gas water heater showing an embodiment of the present invention,

2 is a block diagram showing a control device of a gas water heater according to an embodiment of the present invention;

3 is a block diagram showing a functional configuration of a microcomputer in a control apparatus according to an embodiment of the present invention;

4 is a control characteristic diagram showing the rotation speed of the blower with respect to the combustion amount by the microcomputer in the embodiment of the present invention,

5 is a control characteristic diagram showing the current value of the proportional valve with respect to the rotational speed of the blower by the microcomputer in the embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Gas water heater (combustion device) 30: Control device (control device of combustion device)

42: blower control unit (control value calculation means)

42a: blower control calculation unit (calculation calculation unit)

43: proportional valve control unit (control value calculation means)

43a: proportional valve control calculation unit (calculation calculation unit)

The present invention relates to a control device for a combustion device that calculates a control value for controlling the combustion device according to a control calculation equation.

A combustor machine, such as a hot water heater or a heating device, uses a microcomputer (hereinafter referred to as a microcomputer) to control the combustion state of the combustion apparatus, and is configured by a program in the microcomputer and burner based on a set temperature according to a predetermined calculation formula. The amount of combustion is determined. In response to the determined combustion amount, the control value of the blower or the proportional valve is calculated, and the blower and the proportional valve are controlled based on each control value.

Conventionally, arithmetic expressions for calculating each control value are set for each type of hot water heater or heater based on the burner's ability, etc. Therefore, a plurality of pieces of data for designating arithmetic expressions and their ranges in memory to specify each arithmetic expression Although these data are similar models, they are stored as unique data corresponding to each model.

As described above, the calculation formula used for the control of the combustion device is set so that a control value appropriately determined is obtained based on a combustion test or the like made after the burner unit, the fuel supply system, the blower, etc. are combined as the combustion device.

Therefore, in the development stage where the combustion test is required, only the programs such as combustion sequence and combustion amount determination are included in the memory of the microcomputer, whereas the control value of the blower and the proportional valve that affect the combustion state are included. The formula to be determined is not included in the program because it is preferable to include it as data of the formula after determining the appropriate combustion characteristics. For this reason, in the combustion test, for example, when applying an expression expressed as a primary equation, the coefficient of the primary equation is determined from the minimum and maximum control values assumed to correspond to the minimum and maximum combustion amounts set in the combustion apparatus. It is necessary to perform a test by calculating an integer.

In addition, when these coefficients and constants are determined and stored in the memory as the data of the program, the data for specifying the expressions may be stored in each of the maximum values, the minimum values of the control values corresponding to the combustion amounts, and the coefficients in the first equation, It consists of integers, and the number of data is about six for one linear expression, and calculation according to the linear expression is necessary for confirmation after storing these data in the memory.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a control device for a combustion device that simplifies data, facilitates confirmation thereof, facilitates combustion tests, and the like, with less development burden.

In order to achieve the above object, the present invention includes a control value calculating means having a control calculation formula for calculating a control value of a combustion device corresponding to a target combustion amount determined based on a set temperature, a detection temperature of a thermistor, and the like. A control apparatus for controlling a combustion device based on a control value calculated according to the control calculation formula, the control apparatus comprising: a plurality of pieces of combustion information including a maximum value and a minimum value of a combustion amount, a fan rotation speed, and a plurality of pieces of information of the plurality of combustion amounts, respectively; Technical means is provided with calculation formula calculation means for calculating the control calculation formula in the control value calculation means from a plurality of control value information.

In the control apparatus of the combustion apparatus of the present invention configured as described above, the control calculation equation is calculated by providing a plurality of combustion amount information and control value information corresponding to each combustion amount information to the arithmetic calculation means, and the control calculated when the target combustion amount is determined. The control value is calculated according to the calculation formula, and the combustion device is controlled according to the calculation result of the control calculation formula.

Therefore, in the development stage of the control device, it is easy to find the most appropriate control value by providing a control value corresponding to the plurality of combustion amount information to the calculation formula calculating means and performing a combustion test of the combustion device.

In this case, for example, if the control equation is given as the first equation, the first equation can be specified by providing two control values corresponding to the maximum combustion amount and the minimum combustion amount, and the maximum and minimum combustion amounts, so that the coefficients of the first equation, the constant, etc. This information becomes unnecessary, and it becomes possible to reduce the number of information necessary for specifying the combustion characteristics.

After the combustion test and the like, when the combustion characteristics are determined, the storage means stores a plurality of pieces of combustion information for specifying the control equation and corresponding control value information in the storage means, thereby providing a control device having an optimum combustion characteristic. .

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated based on the Example shown in drawing.

In the gas water heater 1 schematically shown in FIG. 1, 10 is a burner, 11 is a blower for supplying combustion air to the burner 10, and the combustion amount of the burner 10 is installed in the gas supply pipe 11. The proportional valve 12 is adjusted. Moreover, in the gas supply pipe 11, 13 and 14 are gas solenoid valves, and the ignition electrode 15, the frame rod 16, and the thermocouple 17 are provided in proximity to the burner 10, respectively.

On the other hand, 20 is a heat exchanger that is heated by the heat of combustion of the burner 10, 21 is a water supply pipe for supplying water to the heat exchanger 20, 22 is a hot water pipe in which the heated hot water flows out to the heat exchanger 20 , 23 is a bypass pipe for directing the water not heated in the heat exchanger 20 to the tapping pipe 22, 24 is to change the opening degree as necessary to adjust the flow through the bypass pipe 23 Bypass mixing valve.

In the water supply pipe 21, 25 is a pouring control valve, 26 is a water supply sensor for detecting the flow rate, 27 is a water supply temperature thermistor for detecting the water supply temperature, 28 in the tapping pipe 22 is a tapping temperature thermistor and a heat exchanger 20 29 on the downstream side of) is a heating temperature thermistor.

In the gas water heater 1 having the above configuration, the combustion control of the burner 10, the flow rate control for adjusting the flow rate of the water supply pipe 21, and the bypass amount control for adjusting the passage water amount of the bypass pipe 23 are controlled. By the apparatus 20.

The control device 30 is mainly composed of a microcomputer (hereinafter referred to as a microcomputer 40), an input circuit 31, and a driving circuit 32, and the main remote control 33 for setting an operation state of the gas water heater 1. ), A bath remote control 34 is provided.

The microcomputer 40 is composed of an integrated circuit device in which an input / output interface circuit or a memory 50 as a storage device is housed in the same chip. In the memory 50, various data set according to programs and models for each control are stored. I remember.

In the control by the control device 30, the combustion of the burner 10 is started in accordance with a predetermined sequence when water flow is detected in accordance with the opening operation of a faucet (not shown) performed at the downstream end of the tapping pipe 22. The amount of gas passing through the water supply pipe 21 and the amount of water passing through the bypass pipe 23 are controlled at the same time, while controlling the amount of combustion of the burner 10 based on the signals of each remote controller and each thermistor. When is detected, combustion of the burner 10 is stopped.

Hereinafter, the combustion control of the burner 10 by the microcomputer 40 will be described.

In order to perform combustion control, as shown in FIG. 3, the microcomputer 40 is provided with respective functional units of the combustion amount determining unit 41, the blower control unit 42, and the proportional valve control unit 43. As shown in FIG.

In the combustion amount determining unit 41, the combustion amount Q of the burner 10 is initially based on the feed water temperature thermistor 27, the respective detection signals of the water quantity sensor 26, and the set temperature by a predetermined remote controller according to the feedforward control. After that, if the detection signal of the tapping temperature thermistor 28 satisfies a predetermined condition, the detection signal of the heating temperature thermistor 29 and the tapping temperature thermistor 28 is added based on the feedback control. The combustion quantity q is determined and correction is performed so that the tapping temperature according to the set temperature is obtained.

Here, the range of the combustion amount Q determined corresponds to the capability range of the burner 10 for each model, and the minimum combustion amount Qmin and the maximum combustion amount Qmax are provided as the amount of yarn amount range data in the memory 50.

In the combustion control, the blower 11 and the proportional valve 12 are controlled in accordance with the combustion amount Q determined by the above method, but in order for the ratio of the amount of combustion air supplied to the burner 10 to the amount of combustion gas to be appropriate. In the present embodiment, the blower control unit 42 drives the blower 11 in accordance with the determined combustion amount Q, detects the rotation speed thereof, and controls the energizing current value of the proportional valve 12 by the proportional valve control unit 43. It is supposed to be.

The blower controller 42 determines the rotation speed N of the blower 11 in correspondence with each combustion amount Q from the minimum combustion amount Qmin determined by the combustion amount determination unit 41 to the maximum combustion amount Qmax. The blower control calculation formula is set, and given the combustion amount Q, the rotation speed N corresponding thereto is calculated and the current value of the blower 11 is controlled so that the rotation speed N is obtained.

Here, the blower control calculation formula is not given directly according to the model by the program in advance, but the rotation speed range data given to the memory 50 as the maximum rotation speed Nmax and the minimum rotation speed min set for each model. And it is calculated and functions in the microcomputer 40 according to the model from the above-mentioned combustion amount range data, and the blower control part 42 is set by the program by the blower control part calculating part 42a for calculating a blower control operation formula.

Similarly, the proportional valve control unit 43 is proportional to the respective rotation speeds N from the minimum rotation speed Nmin to the maximum rotation speed Nmax detected according to the operation of the blower 11 controlled as described above. When the proportional valve control calculation formula for determining the current value I of the valve 12 is determined, and the rotation speed N of the blower 11 is detected by the rotation speed detection circuit, the current value I is calculated accordingly. The current value of the proportional valve 12 is controlled so that the current value I is obtained.

Here, the proportional valve control equation is not directly given in accordance with the program in the memory 50 as in the above blower control equation, but the maximum current value Imax of the proportional valve 12 set for each model and the rotation speed range data described above. And calculated in the microcomputer 40 according to the model from the current value range data given to the memory 50 as the minimum current value Imin, and the proportional valve control calculation unit 43 calculates the proportional valve control equation. The proportional valve control calculation unit 43a is set.

In summary, in the present embodiment, the combustion amount Q and the rotation speed N of the blower 11 correspond to each other in a linear manner between the maximum value and the minimum value, as shown by a straight line A in FIG. The number of revolutions N of the blower 11 and the current value I of the proportional valve 12 are respectively primarily between the maximum value and the minimum value, as shown in FIG. Have a corresponding relationship. Therefore, each of the above control equations can be expressed as part of the primary function, and the blower control equation calculating section 42a uses the blower control equation representing the straight line A to the maximum and minimum values of the combustion amount Q and the rotational speed N. It is calculated from the coordinates a (Qmax, Nmax) and b (Qmin, Nmin) of two points determined according to the equation, and 2 sets the proportional valve control equation according to the maximum and minimum values of the rotational speed N and the current value I. It calculates from the coordinates c (Nmax, Imax) and d (Nmin, Imin) of a point.

As can be seen here, the information for specifying each control calculation equation is only six data representing the maximum value and the minimum value for the combustion amount Q, the rotation speed N, and the current value I, respectively. It does not include coefficients or integers necessary to represent.

Therefore, in the control device 30 provided in the plural types of hot water heaters designed to have the same basic design, among the data given to the memory 50 provided in the microcomputer 40, the data different for each type is the combustion amount Q. ), And only six pieces of data representing the maximum and minimum values of the rotational speed N and the current value I are used. When the data is checked for each model, the number of data that needs to be confirmed is smaller than before.

In the combustion test before each data is determined, the arbitrary rotation speed N corresponding to the two combustion amounts Q and the arbitrary current value I corresponding to the two rotation speeds N are respectively controlled values. It is only provided as information, and since it is possible to easily perform a test on any control characteristic, the burden in the case of providing data for the test can be reduced.

As a result, a combustion test or the like is easily performed in the development stage of the device, and in the case of confirming the data of the memory 50 after determining the combustion characteristics, the burden of confirmation can be reduced and the data confirmation can be simplified.

In the gas water heater 1 of the present embodiment having the above configuration, the memory 50 does not store the six data indicated by the maximum and minimum values of the combustion amount Q, the rotation speed N, and the current value I. Not only can the combustion test be easily performed, but also appropriate data can be easily determined.

In addition, since each data is stored in the memory 50, even when the data is checked, the number of data to be checked is small, so that the data can be easily checked.

Although the blower 11 corresponding to the combustion amount Q determined in the above embodiment was controlled and the proportional valve 12 corresponding to the rotational speed N of the blower 11 was controlled again, the blower 11 and the proportional valve were controlled. The same applies to controlling (12) at the same time and directly corresponding to the combustion amount Q.

While the gas water heater 1 is shown in the above embodiment, the present invention is also applied to a warm air heater or a floor heater.

As described above, according to the present invention, since the control calculation equation for determining the combustion characteristic is calculated by providing a plurality of combustion amount information and a plurality of control value information corresponding thereto, information necessary for specifying the control calculation equation (data Can be reduced.

Therefore, in the development, a combustion test and the like are easy, and the information (data) after the control characteristic determination is easy to be confirmed.

Claims (1)

A control calculation means including a control calculation formula for calculating a control value of the combustion apparatus corresponding to the target combustion amount determined based on the set temperature and the detection temperature of the thermistor, and the like, based on the control value calculated according to the control calculation formula. A control apparatus for controlling a combustion device, comprising: a plurality of combustion amount information calculated based on a minimum and maximum combustion amount and a minimum and maximum blower rotation speed, and a plurality of control value information respectively corresponding to the plurality of combustion amount information; And an arithmetic expression calculating means for calculating the control arithmetic expression in said control value calculating means.