CN1076771A - The system for controlling heat quantity of burner - Google Patents

Abstract

A calorific value control system for a burner, which calculates the set temperature and Detect the temperature difference of the temperature, divide the temperature difference by the time change Rate, so as to calculate the temperature change value with time, the above temperature The difference and temperature change values are used in predetermined heating step rules to control drive Electric pump, blower motor, fan motor and air outlet window blades Rotational speed or rotation angle can improve the initial response characteristics of the heating step. When the target calorific value is reached, the heat can be supplied in a steady state.

Description

The invention relates to a calorific value control system of a burner, in particular to a method and device for controlling the calorific value of a burner which can improve the initial response characteristic of heat generation and control the calorific value in a stable state when the predetermined calorific value is reached.

As shown in Fig. 1, the conventional burner calorific value control device has a room temperature detection unit 1 for detecting the indoor temperature; according to the temperature detected by the room temperature detection unit 1, it is controlled in a pre-programmed calorific value control mode, and the output A microcomputer 2 for controlling the signal necessary for heat generation; an electronic pump 3 for adjusting the amount of fuel necessary for supply according to the output control signal of the above-mentioned microcomputer 2; an air supply motor unit 4 for adjusting the amount of combustion air necessary for supplying heat; and converting the combustion heat ( Heat) is blown into the room to make it convective fan motor unit 5.

In this way, according to the temperature set during the operation of the burner, the actions of the microcomputer 2, the electronic pump 3, the blower motor unit 4, and the fan motor unit 5 are controlled to guide the burner to generate heat. Simultaneously, the microcomputer 2 receives rotational speed information from the blower motor unit 4 and the fan motor unit 5, and the indoor temperature that changes due to the heat generated by the burner is input to the microcomputer 2 from the room temperature detection unit 1.

In the microcomputer 2, the detected temperature is compared with the preset temperature, and then the fan motor unit 5 is controlled to change the above-mentioned heating value and control it to the set predetermined heating value.

Conventional calorific value control methods are based on the feedback control method, which uses a method of approaching the predetermined calorific value at a predetermined temperature through PID calculation without reducing the error factor that changes with time. Because this PID operation method determines the response characteristics corresponding to the error calorific value based on the determined value of the PID count, so as long as the PID count has no variability, the target value is set during the operation process, and arbitrarily wide control cannot be obtained. In addition, the response characteristic accompanying the PID count setting also has the problem as shown in Figure 2, because the excessive characteristic occurs, so the response speed is slow, and in the normal state, the deviation of the target amount is relatively large.

Therefore, an object of the present invention is to provide a burner calorific value control system that eliminates a normal temperature maintenance error from a response characteristic corresponding to reaching a target calorific value based on the elimination (パ-ジ) theory.

Another object of the present invention is to provide a heating value control method and device, which can accelerate the heating response characteristics of the burner when the burner initially generates heat, and at the same time, when the target heating value is reached, the heating value can be maintained in a stable state.

In order to achieve such an object, the present invention consists of the following steps: in the microcomputer, according to a predetermined program, the step of calculating the temperature difference between the room temperature detected by the room temperature detection unit and the set temperature; the temperature change value calculation step, using The time change value produced by the timer is divided by the temperature difference calculated in the above-mentioned temperature difference calculation step to calculate the temperature change value; using the relational function, according to each temperature difference calculated in the above-mentioned temperature difference calculation step and the temperature change value calculation step and The step of determining the heat generation step by the temperature change value; the heat output control step, according to the setting of the above heat generation step, output the control signal to control the electronic pump speed, fan motor speed and air outlet window blade (ル-バ) that should constitute the heat generation control angle of rotation.

Therefore, the present invention sets up a control device, which relies on the deviation between the room temperature and the set temperature, and sets a timer to calculate the temperature change value, and controls the calorific value of the application machine, as well as the electronic pump, air blowing motor, fan motor and cooling action. control; eliminate the computing device, receive the above-mentioned temperature deviation and temperature change value, and set the heating step according to the relationship function.

Fig. 1 is a schematic diagram of a heat generation control device of an existing burner.

Fig. 2 is a graph showing the heat generation response speed of a conventional burner.

Fig. 3 is a schematic diagram of the calorific value control device used in the present invention.

Fig. 4 is a flow chart of the calorific value control method used in the present invention.

Fig. 5 is a graph and a distribution diagram of the relationship function between the detected temperature and the set temperature applied in the present invention.

Fig. 6 is a distribution diagram of the relationship function of the temperature difference applied to the time change rate in the present invention.

Fig. 7 is a rule chart of heating steps applied in the present invention.

Figure 8 is a graph of the heating step rules applied by the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Fig. 3 is a schematic diagram of a calorific value control device for an oil burner applicable to the present invention. This calorific value control device is composed of the following units. A room temperature detection unit 21 for detecting indoor temperature; a microcomputer 20 comprising a control unit 22 and an elimination operation unit 23, the control unit 22 inputs the room temperature detected by the room temperature detection unit 21 after A/D conversion, and compares the data with the pre-stored Comparing the set temperature data, calculating the temperature difference, and simultaneously calculating the temperature change value with time and outputting, the elimination operation unit 23 receives the above-mentioned temperature difference signal, and the temperature change value signal calculated by the timer according to the time change rate, These signals are stored and eliminated according to the relational function, thereby setting the heating step, and then calculating the signals of the heating value control, the fan motor speed and the rotation angle of the louver blade in the set heating step; by the output of the above-mentioned microcomputer 20 Signal-driven electronic pump 24, blower motor 25, fan motor 26, air outlet window blade 27, etc.

Fig. 4 is a flow chart of the method for controlling the calorific value of the burner of the present invention. The method consists of steps as follows: an initial driving step 403, which is composed of an initialization step 400, a heating temperature setting step 401, and each driving unit driving step 402; a room temperature detection step 404 for detecting indoor temperature during the initial driving in the above-mentioned initial driving step 403 ; judging whether the above-mentioned detected room temperature is greater than the room temperature judging step 405 of the above-mentioned set heating temperature; if the above-mentioned room temperature judging step 405 judges that the room temperature is hours, the timing step 406 is performed by a timer; subtracting the room temperature detection from the above-mentioned set temperature temperature, thereby calculating the temperature difference calculation step 407 of the temperature difference; the temperature difference change value calculation step 408; dividing the temperature difference calculated in the above-mentioned temperature difference calculation step 407 by the time change value, and calculating the temperature difference time change value; according to the above-mentioned calculated temperature difference time change value, calculate the heating calculation step 409 with the predetermined heating step rules of each drive unit; use the heating step calculated by the above-mentioned heating calculation step 409 to control and drive the electronic pump, blower motor, and fan Control drive step 410 of the motor and air outlet window blades; heat drive step 411, if the room temperature judgment step 405 judges that the room temperature is the same as the set temperature, then use the heat generation step corresponding to the set temperature to drive each drive unit.

Fig. 5 shows the relationship function between the current temperature and the set temperature applied in the present invention. a of Fig. 5 shows the predetermined set temperature for target quantity control in the burner, that is, the A/D data stored in the microcomputer. b of FIG. 5 shows the A/D conversion data of each indoor temperature. C of FIG. 5 shows a relational function of the temperature difference between the detected temperature and the set temperature.

As shown in the figure, when the input condition determined by the temperature difference, that is, the range of the difference between the current detected temperature and the set temperature is (-15, -14, ... -1.0...1...14, 15),

1) If the above-mentioned temperature difference is very large in the positive direction, it will be displayed as a large positive number;

2) If the above temperature difference is small in the positive direction, it will be displayed as a small positive number;

3) If there is no temperature value, the displayed change is zero;

4) If the above temperature difference is smaller in the reverse direction, a small negative number will be displayed;

5) If the above temperature difference is large in the reverse direction, a large negative number will be displayed.

Fig. 6 shows the relationship function of temperature difference versus time rate of change applied by the present invention. When the indoor temperature changes as (-15, -14, ... -1.0 ... 1, ... 14, 15),

a shows the situation of positive change when the temperature change is 0 degrees;

b shows that when the temperature change is 0 degrees, the change is zero;

c shows the case where the temperature changes to a negative direction when the temperature change is 0 degrees.

Fig. 7 shows the relational function of the heating step applied by the present invention. That is, the calculation results of the heating steps for the above temperature difference and the time change rate of the temperature difference:

a shows the heating step when the heating value is extremely large;

b shows the step of generating heat with a large amount of heat;

c shows the heating step when the heating value is in the middle;

d shows a heating step with a small calorific value;

e shows the heat generation step when the heat generation amount is minimum.

FIG. 8 shows the calculation rules of the relative temperature difference and the time rate of change of the temperature difference applied in the present invention.

a shows the calculation method of heating steps;

b shows the speed calculation of the fan motor;

c shows the calculation of the wind direction angle of the louver blade.

The operation and effect of the present invention will be described below.

First, if the burner is powered on and the temperature corresponding to the heating operation is set, then the microcomputer 20 performs the initialization step 400 and the heating temperature setting step 401 as shown in FIG. The driving step 402 of each driving unit is to drive the electronic pump, the air blowing motor, the fan motor and the blades of the air outlet window by driving the burner.

In such a driving state, the microcomputer 20 performs a room temperature detection step 404 and receives a changed room temperature signal from the room temperature detection unit 21 . Next, the room temperature judgment step 405 is performed to determine whether the detected room temperature is greater than the set temperature. When the detected room temperature is greater than the set temperature, the heat generation calculation step 411 is performed to control the heat generation with the set heat generation step and drive the burner. ; If the room temperature judgment step 405 judges that the detected room temperature is less than the set temperature, perform the timing step 406, drive the timer to calculate the time, and then perform the temperature difference calculation step 407, from the data corresponding to the set temperature shown in Figure 5a Subtract the data value corresponding to the detected room temperature shown in Figure 5b, calculate it in 5 steps corresponding to the temperature difference ΔT, and output it.

Here, the microcomputer 20 proceeds to the temperature difference change value calculation step 408, divides the temperature difference value ΔT calculated in the temperature difference value calculation step 407 by the time Δt counted by the above-mentioned timing step 406, and calculates the temperature difference value ΔT corresponding to the temperature change value of 3 Perform calculations under these steps and output corresponding signals.

The microcomputer 20 thus performs the heat generation calculation step 409, inputs and stores the temperature difference ΔT and the temperature change value ΔT/Δt in the calculation control unit 23, and sets the heat generation step through a predetermined program. Therefore, under the heating steps set in this way, the calorific value control, calculation and control of the fan motor speed and the rotation angle signal of the air outlet window blades are carried out, and the electronic pump, the air blowing motor, the fan motor and the air outlet window blades are controlled by the control signal, thereby guiding The heating action of the burner. That is, if the temperature change of the temperature difference ΔT is as shown in Figure 5c, when the positive direction is small (PS), the temperature change value ΔT/Δt is shown in Figure 6, and changes in the positive direction (P), Then, the heating step calculates the corresponding heating step, and controls the air volume (rotational speed of the blower motor) and the fuel volume (frequency of the electronic pump). As an example, in any heating step, if the temperature difference ΔT is small in the positive direction, and the temperature change value ΔT/Δt changes in the positive direction, then according to the calculation rule shown in Figure 8a, the heating step is stronger. Drive, the relationship function of this heating step is shown in Figure 7b. In addition, regarding the speed of the fan motor, as shown in Figure 8b, the air volume is calculated using the middle (M) rotation frequency. In addition, as shown in Figure 8c, the rotation angle of the louver blade is turned to the middle (M) rotation angle, and the calculation Air volume. The relationship function of the heating step is also applicable to the fan motor speed and the angle of rotation of the air outlet window blade.

The calculation signal of the heat generation step corresponding to the heat generation step calculated by the operation control unit 23 as described above, the amount of fuel, the fan motor and the air outlet window blade, is input to the control unit 22, and the control unit 22 performs the control drive step 410. , use the above-mentioned calorific steps calculated by the above-mentioned calculation control unit 23 to control and drive the electronic pump 24, the air blowing motor 25, the fan motor 26 and the air outlet window blade 27, and carry out the combustion drive control to make the timer initialized, and then perform room temperature heating. In the detection step 404, the room temperature is detected again, and the heating steps are calculated, and the driving is performed until the predetermined set temperature is reached.

As mentioned above, the heat generation control system of the burner in the present invention has the following advantages: by calculating the temperature difference between the set temperature and the detected temperature, and calculating the temperature change value according to the time change rate of the temperature difference, Apply the above-mentioned temperature difference and temperature change value to the predetermined heating step rule to control the speed of the electronic pump, air supply motor, fan motor and air outlet window blades, so as to improve the initial response characteristics of heating, and after reaching the target heating value , The calorific value can be supplied in a steady state, and the present invention has the advantages as described above.

Claims (3)

1. A method for controlling the calorific value of a burner, characterized in that it comprises the following steps: Comparing the room temperature detected by the room temperature detection unit with the set temperature to calculate the temperature difference calculation step; Dividing the temperature difference calculated in the above temperature difference calculation step by the time change value generated by the timer to calculate the temperature change value calculation step of the temperature change value; Using the temperature difference and the temperature change value calculated in the temperature difference calculation step and the temperature change value calculation step for the relationship function to determine the heating step setting step of the heating step; According to the setting of the heat generation above, the control signal is output to control the speed of the electronic pump, the speed of the fan motor and the rotation angle of the blades of the air outlet window, so as to control the heat generation. 2. A method for controlling the calorific value of a burner, which includes an initial driving step 403 when the burner is powered on. This step includes an initialization step 400, a heating temperature setting step 401, and each driving unit driving step 402. After the room temperature detection Step 404 and room temperature judgment step 405, determine and drive the heating step, It is characterized in that it also includes: If the above-mentioned room temperature judging step 405 judges that the room temperature is small, then the timing step 405 by the timer; Subtract the room temperature detection temperature from the above set temperature, calculate and output the temperature difference ΔT temperature difference calculation step 407; Divide the temperature difference calculated in the above-mentioned temperature difference calculation step 407 by the time change rate, and calculate the temperature difference time change value ΔT/Δt in the temperature difference time change value calculation step 408; Calculate the heat generation calculation step 409 of the heat generation step according to the predetermined heat generation step rule corresponding to the above temperature difference value and the temperature difference time change value; Using the heating steps calculated by the above-mentioned heating calculation step 409 to control the electronic pump, the air supply motor, the fan motor and the control drive step 410 of the air outlet window blade; Calculating the heating steps and driving until reaching the set temperature in the heating driving step 411 . 3. A burner calorific value control system, characterized in that it is provided with: Calculate the difference between the room temperature and the set temperature and the temperature change over time, control the calorific value of the application machine and the control device for the action of the electronic pump, air supply motor, fan motor and air outlet window blades; It is a microcomputer composed of an arithmetic device that receives the above-mentioned temperature difference value and temperature change value, and determines the heating step according to the relational function.

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