JP3534864B2 - Recording method of output value of air flow sensor and correction method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a burner and a combustion fan for supplying and exhausting air, and an air flow sensor outputs a value corresponding to the air flow in an air flow path from an air supply section to the burner to an exhaust passage. However, the present invention relates to a recording method of an output value of an air volume sensor and a correction method thereof, in which a 0-point output value when there is no air volume and a maximum output value when the air volume is maximum are written in a memory in a combustor.

[0002]

2. Description of the Related Art A burner is provided in a combustor, and an air flow sensor is provided in an air flow path from an air supply section to the burner to an exhaust passage. The air flow sensor generally has some variations in its output value depending on the individual sensor,
In addition, the output value changes due to aging, and the air flow sensor is inspected at the product shipping stage, equipment maintenance, etc., and the air flow sensor detection value has a preset tolerance. When it is out of the range, it is judged to be defective and is discarded. On the other hand, as the air volume sensor, a hot-wire type wind speed sensor or a diaphragm type differential pressure sensor is used. It is known that the output value of the hot wire type wind speed sensor has little variation at the time of manufacture, but the output value changes due to aging, and the output value of the diaphragm type differential pressure sensor has great variation at the time of manufacture. . Although it is possible to obtain the relational expression between the current value to the combustion fan drive motor and the air flow rate of the combustion fan, there is variation in the coil resistance of the combustion fan drive motor, and it is necessary to make an initial correction. On the other hand, it is known that the coil of the drive motor is less susceptible to aging.

[0003]

However, if the detected value of the air flow sensor deviates from the tolerance range even a little, it will be discarded and the sensor cannot be effectively used, and the cost of equipment and maintenance will increase. There was a problem. The present invention has been made to solve the above-mentioned conventional problems, and the output value measured by a standard calibrator is written in the memory in the combustor, and the output value of the air flow sensor is corrected if necessary. Therefore, even if the output value of the air flow sensor is out of the tolerance range, it is possible to effectively use the output value of the air flow sensor without discarding it and to provide a correction method therefor. I am trying.

[0004]

[0005]

[0006]

[Means for Solving the Problems] [1] Burner (13)
And a combustion fan (12) for supplying and exhausting air, and the air volume sensor (18) outputs a value according to the air volume in the air circulation path from the air supply section to the burner (13) to the exhaust passage,
In the correction method of the output value of the air volume sensor, the 0 point output value when there is no air volume and the maximum output value when the air volume is maximum are written in the memory (30) in the combustor. Based on the written data, the combustion fan (12) is rotated to set the state when there is no air volume and the state when the air volume is maximum, and the combustion fan (1
2) The relationship between the input value to the drive motor and the air flow rate of the combustion fan (12) is obtained, and the obtained relationship is stored in the memory (3).
0) A method for correcting the output value of the air flow sensor, which is characterized in that it is written into

[2] A burner (13) and a combustion fan (12) for supplying and exhausting air are provided, and a value corresponding to the air volume in the air circulation path from the air supply section to the burner (13) to the exhaust passage is set. 0 when the air volume sensor (18) outputs and there is no air volume
In the method of correcting the output value of the air volume sensor, the point output value and the maximum output value when the air volume is maximum are written in the memory (30) in the combustor, the input to the drive motor of the combustion fan (12). Based on the relationship between the value and the air flow rate of the combustion fan (12), the inside of the air flow passage is set to a state where there is no air volume and a state where the air volume is maximum, and in each of the states, the air volume sensor (18) is used to A zero point output value and the maximum output value are respectively measured, and the data in the memory (30) is rewritten using the measured zero point output value and the maximum output value as correction data. How to correct the output value of the air flow sensor.

[3] A burner (13) and a combustion fan (12) for supplying and exhausting air are provided, and a value corresponding to the air volume in the air distribution path from the air supply section to the burner (13) to the exhaust passage is set. 0 when the air volume sensor (18) outputs and there is no air volume
In the correction method of the output value of the air volume sensor, which writes the point output value and the maximum output value when the air volume is maximum in the memory (30) in the combustor, the 0 point output value and the maximum output value are Each is measured by a standard calibrator, and the measured zero-point output value and maximum output value are written as initial data in the memory (30) to be mounted in the combustor and written in the memory (30). Based on the initial data
The combustion fan (12) is rotated to set the state when there is no air volume and the state when the air volume is maximum, and the input value to the drive motor of the combustion fan (12) and the sending of the combustion fan (12) in each state described above. The relationship with the air volume is calculated, and the calculated relationship is written in the memory (30).
Based on the relationship between the input value to the drive motor of the combustion fan (12) written in 0) and the air flow rate of the combustion fan (12), the state and the air flow rate in the air flow passage when there is no air flow are the maximum. And the air flow sensor (1
According to 8), the 0-point output value and the maximum output value are measured, and the measured 0-point output value and the maximum output value are used as correction data to rewrite the data in the memory (30). The present invention resides in a method for correcting the output value of the air flow sensor.

[0009]

Operation: For example, a hot-wire wind velocity sensor that does not require initial correction should be used as a standard calibrator, the calibration data of the wind velocity sensor should be measured, and the measured calibration data should be installed in the combustor. Since I tried to write in the memory (30),
Based on the output value of the air volume sensor (18), for example, the electric value to the drive motor of the combustion fan (12) can be controlled to obtain an appropriate air volume.

Similarly, a hot wire type wind speed sensor which does not require initial correction is used as a standard calibrator, and the 0-point output value when there is no air volume and the maximum output value when the air volume is maximum are measured, respectively. Since the measured 0-point output value and the maximum output value are written as initial data in the memory (30) to be mounted in the combustor, for example, based on the output value of the air flow sensor (18), An appropriate amount of air can be obtained by controlling the current value to the drive motor of the fan (12).

Based on the initial data written in the memory (30), the combustion fan (12) is rotated to set the state when there is no air volume and the state when the air volume is maximum, and the combustion fan in each of the above states. In the case where the relationship between the input value to the drive motor of (12) and the air flow rate of the combustion fan (12) is obtained and the obtained relationship is written in the memory (30), for example, the combustion fan (12) ), Even if there is a large variation in the drive motor coil resistance that cannot be ignored, the combustion fan (1
The relationship between the input value to the drive motor in 2) and the air flow rate of the combustion fan (12) can be newly obtained, the obtained relationship is written in the memory (30), and the relationship written in the memory (30) is used. For example, an appropriate amount of air can be obtained by controlling the current value to the drive motor of the combustion fan (12).

Based on the relationship between the input value to the drive motor of the combustion fan (12) and the air flow rate of the combustion fan (12), the state in which there is no air volume in the air flow passage and the maximum air volume State, and the air flow sensor (1
According to 8), the 0-point output value and the maximum output value are measured, and the measured 0-point output value and the maximum output value are used as correction data to rewrite the data in the memory (30). For example, for example, a diaphragm type differential pressure sensor whose output value varies during manufacturing,
Even when an output value of the air flow sensor (18) that is slightly out of the tolerance range is installed in the combustor, for example, the input value to the drive motor of the combustion fan (12) and the air flow rate of the combustion fan (12). Memory (3
It is possible to correct the initial data regarding the 0-point output value and the maximum output value in 0), and it is possible to continuously and effectively use the air volume sensor (18) without discarding it.

The 0-point output value and the maximum output value are measured by a standard calibrator, and the measured 0-point output value and the maximum output value are set as initial data in the combustor. Writing to the memory (30), the memory (3
Based on the initial data written in 0), the combustion fan (12) is rotated to set the state when there is no air volume and the state when the air volume is maximum, and the combustion fan (1
2) The relationship between the input value to the drive motor and the air flow rate of the combustion fan (12) is obtained, and the obtained relationship is stored in the memory (3).
0) so that the air flow path is filled in the air flow path based on the relationship between the input value to the drive motor of the combustion fan (12) and the air flow rate of the combustion fan (12) written in the memory (30). The state when there is no air volume and the state when the air volume is maximum are set, and in each state, the 0 point output value and the maximum output value are measured by the air volume sensor (18),
If the data in the memory (30) is rewritten by using the measured 0-point output value and the maximum output value as correction data, the coil resistance of the drive motor of the combustion fan (12) is less likely to change over time. Therefore, the input value to the drive motor of the combustion fan (12) and the combustion fan (1
The relationship with the air flow rate of 2) is also stable, and based on this relationship, for example, the maximum output value of the air volume sensor (18) such as a hot-wire wind speed sensor that is easily subject to secular change is corrected according to the secular change. For example, the air flow sensor (18) can be continuously used without being discarded during maintenance.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Each drawing shows an embodiment of the present invention. As shown in FIG. 2, a burner 13 is installed below the combustion chamber 11 of the combustor 10, and a combustion fan 12 for supplying and exhausting air is provided below the burner 13. Combustion fan 12
Is provided with a rotation detection sensor. A hot water supply heat exchanger 14 is provided above the combustion chamber 11, and the hot water supply heat exchanger 1
4, a water supply pipe 15 is connected to the inlet side of the hot water supply heat exchanger 1
A hot water supply pipe 15a is connected to the outlet side of No. 4. The gas supply passage 16 of the burner 13 is connected, and the lower side of the burner 13 and the combustion chamber 11 communicate with each other through a bypass passage 17. An air flow sensor 18 is provided in the middle of the bypass passage 17. As the air flow sensor 18, a hot wire type wind speed sensor or a diaphragm type differential pressure sensor is used. A hot-wire anemometer is a device in which the flow velocity is output as a change in current, and the wind velocity is usually measured by the amount of heat taken from a wire such as a platinum wire, but there is also a silicon substrate provided with this. The diaphragm type differential pressure sensor is burner 1
3, the difference between the pressure on the combustion fan 12 side and the pressure on the combustion chamber 11 side is output as a current change.

FIG. 1 shows a block diagram relating to air volume control of a combustor. For air volume control, the control unit 2 which is a CPU
It has 0. The control unit 20 is connected to a power supply circuit (not shown) and a clock (not shown) for timing of taking in the output value of the air flow sensor 18. The output value of the air flow sensor 18 is input to a memory 30 described later via an amplification circuit and an AD conversion circuit (not shown).

As the memory 30, a memory composed of a RAM or a rewritable EEPROM is used. The memory 30 has a control program and data in the memory 30 during operation (the air volume sensor 1 when there is no air volume).
A correction program for correcting the zero point output value of 8 and the maximum output value of the air volume sensor 18 when the air volume is maximum, data for calculating the target sensor output corresponding to the gas volume, and the combustion fan 12 described later. The relationship between the current value, which is the input value to the omitted drive motor, and the air flow rate of the combustion fan 12 is recorded at the time of shipment. Further, in the memory 30, initial data of a 0-point output value when there is no air volume and a maximum output value when the air volume is the maximum measured by a standard calibrator using a hot-wire wind velocity sensor are recorded at the time of shipment. Has been done.

The writing of data to the memory 30 at the time of shipment is configured so that the operation of the control unit 20 is switched from the operation mode to the data writing mode when the mode changeover switch 41 is turned on. The correction of the data in the memory 30 during operation is performed based on the correction program of the memory 30. The torque value of the combustion fan 12 is the output value detection unit 4
2 and is recorded in the memory 30. Further, the current value to the drive motor is detected by the current value detection unit 43 and is similarly recorded in the memory 30. Combustion fan 12
The air flow rate of is calculated by the calculation unit 44 based on the detection value of the output value detection unit 42.

As shown in FIG. 3, the relationship between the current value to the drive motor and the air flow rate of the combustion fan 12 is as follows.
Each rotation speed (1000, 2000 and 3000 rp
m), the degree of closure (10% from 0% to 90%)
Data of the current value and the air flow rate for each point
The data of each point is recorded in the memory 30. The control unit 20 sends a fan rotation speed control signal to the drive circuit 50 based on the output value of the air flow sensor 18 and the data for calculating the fan rotation speed recorded in the memory 30. Uses the fan rotation speed control signal and electric energy from outside the control system to burn the combustion fan 1
The necessary current is supplied to the second drive motor.

Next, the operation will be described. At the time of shipment,
The 0-point output value when there is no air volume and the maximum output value when the air volume is maximum are written in the memory 30. At this time, the operation of the control unit 20 is switched to the data writing mode by the mode changeover switch 41.

As a standard calibrator, for example, a hot-wire wind velocity sensor that does not require initial correction is used, and the air flow sensor 1
8 is connected in series, the calibration data is measured and bar-coded after measurement, and the data is displayed on the sensor. The calibration data of the air flow sensor attached on the production line can be displayed on a personal computer using a bar-code reader on the production line, for example. It is input and written by the ROM writer into the memory 30 such as an EEPROM when mounted in the combustor. Bypass passage 1
7, an air flow sensor 18 and a standard calibrator are provided,
The combustion fan 12 is appropriately rotated, and the zero point output value when there is no air volume and the maximum output value when the air volume is maximum are measured and compared by the air volume sensor 18 and the standard calibrator, respectively, and the calibration data is obtained. You may get In the production line, the current value to the combustion fan 12 is measured by the current value detection unit 43, and the torque value of the drive motor is measured by the output value detection unit 42. The relationship between the current value and the air flow rate of the combustion fan 12 is plotted at 10 points for each rotation speed of the combustion fan 12, and the related numerical values are written in the memory 30. At this time, the torque value of the drive motor is once output to the memory 30, converted into a numerical value of the air flow rate by the calculation unit 44, and the numerical value of the air flow rate is output to the memory 30 again.

As a result, for example, even if the coil resistance value of the drive motor of the combustion fan 12 varies during manufacture, the combustion fan 12 that takes the variation into consideration.
The relationship between the current value to the drive motor and the air flow rate of the combustion fan 12 can be obtained at the time of shipment, and the obtained relationship can be written in the memory 30. Then, after shipment, the memory 30
Based on the relationship written in, it becomes possible to measure the accurate air flow rate of the combustion fan 12, and the current value to the drive motor of the combustion fan 12 can be controlled to obtain an appropriate air flow rate by the combustion fan 12. Bypass passage 17 at the time of shipment
The air volume sensor 18, that is, the sensor associated with the memory 30 in which the calibrated zero point output value and the maximum output value are written is installed.

If the installed air flow sensor 18 is one whose output value is slightly out of the tolerance range, such as a diaphragm type differential pressure sensor in which its output value varies at the time of manufacture, the above-mentioned, Based on the relationship between the current value to the drive motor of the combustion fan 12 and the air flow rate of the combustion fan 12, the state when there is no air volume and the state when the air volume is maximum are set, and the 0 point of the air volume sensor 18 in each state. The memory 3 previously written using the output value and the maximum output value as correction data.
The initial data regarding the 0-point output value within 0 and the maximum output value is corrected. As a result, there are variations in the output value,
For example, the air volume sensor 18 outside the tolerance range can be effectively used without being discarded.

When the air flow sensor 18 is a hot wire type wind speed sensor, the output value at the time of manufacture of the wind speed sensor is relatively uniform, but by performing the calibration, it can be used as a more accurate sensor. You can In addition, since it is susceptible to aging, the memory 3
It is necessary to periodically rewrite the data in the memory 30 based on the correction program in 0. On the other hand, combustion fan 1
The coil resistance of the drive motor of 2 is less susceptible to aging,
Therefore, the relationship between the current value to the drive motor of the combustion fan 12 and the air flow rate of the combustion fan 12 is also stable, and based on this relationship, for example, an air flow sensor such as a hot-wire wind speed sensor that is susceptible to aging. The maximum output value of 18 can be corrected as needed.

That is, based on the relationship between the current value to the drive motor of the combustion fan 12 and the air flow rate of the combustion fan 12,
Confirm the condition that there is no wind outside the equipment and rotate the fan to adjust the correction data acquisition condition When there is no fan air volume under the condition that there is no wind influence (FAN.OFF) and the fan air volume is maximum (FAN.MAX) state, and the 0-point output value and the maximum output value of the air flow sensor 18 in each state are used as correction data, and the 0-point output value and the maximum output in the memory 30 previously written. Correct the initial data for values and.
Thereby, for example, when the air flow sensor 18 is subject to a secular change, the data in the memory 30 is rewritten according to the change, so that the instrument stops due to an error, and the user requests repair and the repairman. Can be used continuously without replacing and discarding the air flow sensor. FAN. It is obtained when the output of the air flow sensor 18 does not change for a certain time or longer under the OFF condition. Further, the life of the air volume sensor 18 can be determined from the relationship between the current value to the drive motor of the combustion fan 12 and the air flow rate of the combustion fan 12, and the zero point output value and the maximum output value of the air volume sensor 18. At the same time, it is possible to determine the clogging of the exhaust port, which is the end of the air circulation path.

In the above embodiment, the combustor 10 shown in FIG. 2 was used as a model. However, the combustor of the present invention is not necessarily limited to this. For example, a combustion type heating machine or cooling machine. , Air conditioners, and other various combustors. Further, although the current value is used as the input value of the drive motor of the combustion fan 12, the present invention is not limited to this and may be a voltage value or a pulse number depending on the type of the drive motor.

[0026]

According to the method for recording the output value of the air flow sensor and the correction method therefor according to the present invention, the output value measured by the standard calibrator is written in the memory in the combustor, and the output value of the air flow sensor is output if necessary. Even if the output value of the air flow sensor is out of the tolerance range, it can be effectively used without discarding it.

[Brief description of drawings]

FIG. 1 is a block diagram of a control circuit showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a combustor showing an embodiment of the present invention.

FIG. 3 is a correlation diagram showing the relationship between the current value to the drive motor of the combustion fan and the air flow rate of the combustion fan showing the embodiment of the present invention.

[Explanation of symbols]

10 ... Combustor 11 ... Combustion chamber 12 ... Combustion fan 13 ... Burner 14 ... Hot water heat exchanger 15 ... Water pipe 16 ... Gas supply passage 17 ... Bypass passage 18 ... Air flow sensor 20 ... Control unit 30 ... Memory 41 ... Mode changeover switch 42 ... Output value detector 43 ... Current value detector 44 ... Arithmetic unit 50 ... Drive circuit

Front page continuation (72) Inventor Akira Nakayama 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Gaster Co., Ltd. (56) References JP-A-7-287601 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) F23N 3/08

Claims (3)

(57) [Claims] 1. A burner and a combustion fan for supplying and exhausting air, wherein an air volume sensor outputs a value corresponding to the air volume in an air circulation path from an air supply section to the burner to an exhaust passage, and when there is no air volume. In the method of correcting the output value of the air volume sensor, which writes the 0-point output value and the maximum output value when the air volume is maximum to the memory in the combustor, the combustion fan is controlled based on the data written in the memory. By rotating, the state when there is no air volume and the state when the air volume is the maximum, to determine the relationship between the input value to the drive motor of the combustion fan and the air flow rate of the combustion fan in each state, the relationship obtained A method for correcting an output value of an air flow sensor, characterized in that it is written in the memory. 2. A burner and a combustion fan for supplying and exhausting air, wherein an air flow sensor outputs a value corresponding to an air flow in an air circulation path from an air supply section to the burner to an exhaust passage, and when there is no air flow In the method of correcting the output value of the air volume sensor, the zero point output value and the maximum output value when the air volume is maximum are written in the memory in the combustor, the input value to the drive motor of the combustion fan and the combustion fan On the basis of the relationship with the air flow rate, the inside of the air flow passage is set to a state where there is no air volume and a state where the air volume is maximum, and in each of the states, the 0-point output value by the air volume sensor,
A method for correcting an output value of an air volume sensor, characterized in that the maximum output value is measured, and the measured 0-point output value and the maximum output value are used as correction data to rewrite the data in the memory. . 3. A burner and a combustion fan for supplying and exhausting air, wherein an air flow sensor outputs a value corresponding to the air flow in an air circulation path from an air supply section to the burner to an exhaust passage, and when there is no air flow In the correction method of the output value of the air volume sensor, the zero output value and the maximum output value when the air volume is maximum are written in the memory in the combustor, and the zero output value and the maximum output value are standardized. Each is measured by the calibrator of, and the measured 0-point output value and the maximum output value are written as initial data in a memory to be mounted in the combustor, and based on the initial data written in the memory, By rotating the combustion fan, the state when there is no air volume and the state when the air volume is the maximum, the relationship between the input value to the drive motor of the combustion fan and the air flow rate of the combustion fan in each state is obtained, The relationship Based on the relationship between the input value to the drive motor of the combustion fan and the air flow rate of the combustion fan written in the memory, the state and the air volume when there is no air flow in the air flow passage are the maximum. Time state, and in each of the states, the zero point output value by the air flow sensor,
A method for correcting an output value of an air volume sensor, characterized in that the maximum output value is measured, and the measured 0-point output value and the maximum output value are used as correction data to rewrite the data in the memory. .