JP2011106910A - Method of converting measurement value of thermosensitive resistor element into wind velocity and wind velocity sensor system - Google Patents

Abstract

The present invention provides a method for converting a measured value of a temperature-sensitive resistance element capable of measuring wind speed at high speed into wind speed.
A wind speed sensor system (10) includes a wind speed sensor (20) having a first temperature sensitive resistance element (21a) sensitive to wind speed and a second temperature sensitive resistance element (21b) sensitive to temperature. In addition, the wind speed sensor system 10 uses the first elementary function f ₁ having the measured value V ₁ of the first temperature sensitive resistance element 21a as an independent variable and the measured value V ₂ of the second temperature sensitive resistance element 21b as an independent variable. a second elementary functions f _2, using the measurement value conversion expression with, comprises a computer 40 for converting the measured values of the temperature sensitive resistive element to wind speed. Furthermore, the wind speed sensor system 10, along with generating heat to a temperature above room temperature by driving the first temperature sensitive resistor element 21a, and outputs the measured values V ₁ based on the resistance value of the first temperature sensitive resistor element 21a, and It drives the second temperature sensitive resistor element 21b, a driving detection circuit 30 which outputs a measured value V ₂ based on the resistance value of the second temperature sensitive resistor element 21b.
[Selection] Figure 1

Description

  The present invention relates to a method for converting a measured value of a temperature sensitive resistance element into a wind speed and a wind speed sensor system.

  Conventionally, a wind speed sensor is used to measure the wind speed.

  The wind speed sensor has a temperature sensitive resistance element such as a thermistor. This temperature-sensitive resistance element has a characteristic that the resistance value changes with temperature, and this characteristic is used as a wind speed sensor.

  The change in the resistance value of the temperature sensitive resistance element is measured, for example, as the output voltage of the temperature sensitive resistance element. And measured values, such as a voltage measured by the wind speed sensor, are converted into wind speed after that.

  Generally, a wind speed sensor has two temperature-sensitive resistance elements. This is because it is not easy to obtain the wind speed from the measured value of only one temperature-sensitive resistance element. Since the resistance value of the temperature-sensitive resistance element literally changes depending on the temperature, even if the wind speed of the measurement airflow is the same, the resistance value of the temperature-sensitive resistance element differs if the ambient temperature is different. That is, the measured value of the temperature sensitive resistance element depends on two parameters, wind speed and temperature.

  On the other hand, the measurement value of the temperature sensitive resistance element that is not affected by the airflow can be converted into temperature by using a correspondence table that summarizes the correspondence between the measurement value and temperature or a conversion formula.

  Therefore, in the wind speed sensor, by using two temperature-sensitive resistance elements, the wind speed is measured by one temperature-sensitive resistance element, and one temperature-sensitive resistance element is measured by using the measured value of the other temperature-sensitive resistance element. Temperature compensation for wind speed is performed.

  For example, when converting a measurement value measured by a wind speed sensor into a wind speed, it has been proposed to use a correspondence table that summarizes the correspondence between the measurement value and the wind speed for each temperature. That is, when the ambient temperature is measured by the other temperature sensitive resistance element and the wind speed is obtained from the measured value measured by the one temperature sensitive resistance element, the correspondence table of the ambient temperature at that time is used. When such a correspondence table is used, the measurement accuracy of the wind speed is improved by creating a large number of correspondence tables in which the temperature increment of the ambient temperature is small.

  In addition, a wind speed sensor using a linearization circuit that linearizes a measurement value of one temperature-sensitive resistance element that measures the wind speed has been proposed. This is for facilitating conversion from the measured value to the wind speed by providing linearity to the measured value of one of the temperature sensitive resistance elements. Specifically, the ambient temperature is measured by the other temperature-sensitive resistance element, and the measured value of the one temperature-sensitive resistance element that has been linearized is converted into the wind speed using the correspondence table for the ambient temperature.

JP-A-1-303811 JP 2000-266773 A

  For example, in order to control air conditioning in a large room such as a data center or a factory, it is considered to use a large number of wind speed sensors. In order to efficiently control the air conditioning in such a wide space, it is considered effective to use a large-scale sensing system having hundreds to tens of thousands of wind speed sensors.

  However, when converting the measured value of the temperature sensitive resistance element into the wind speed using the correspondence table described above, it is necessary to create a large number of correspondence tables with small temperature increments in order to improve the measurement accuracy of the wind speed. Therefore, a large memory capacity is required for storing these correspondence tables. In addition, conversion to wind speed using a correspondence table for each wind speed sensor is a time-consuming process. Accordingly, it is not suitable for a large-scale sensing system to convert the measured value of the temperature sensitive resistance element into the wind speed using the correspondence table.

  In addition, using a linearization circuit that linearizes the measurement value of the temperature-sensitive resistance element provides an additional circuit or component for the wind speed sensor, which complicates the structure of the wind speed sensor and increases the manufacturing cost of the wind speed sensor. . Moreover, when the measured value of the temperature sensitive resistance element is linearized, the sensitivity to the wind speed may be reduced. Further, using the correspondence table causes the same problem as described above. Therefore, it is not suitable for a large-scale sensing system to use a linearization circuit that linearizes the measurement value of the temperature sensitive resistance element.

  This specification aims at providing the method of converting the measured value of the temperature sensitive resistance element which can measure a wind speed at high speed into a wind speed.

  Moreover, this specification aims at providing the method of converting the measured value of the temperature sensitive resistance element which can simplify the structure of a wind speed sensor into a wind speed.

  According to one embodiment of the method for converting the measured value of the temperature sensitive resistance element disclosed in this specification into the wind speed, the first elementary function having the measured value of the first temperature sensitive resistance element as an independent variable, and the second temperature sensitive value. The measured value of the temperature-sensitive resistance element is converted into the wind speed using a measured value conversion equation including a second elementary function having the measured value of the resistance element as an independent variable.

  According to one aspect of the method for converting the measured value of the temperature-sensitive resistance element disclosed in the present specification into the wind speed, the wind speed can be measured at a high speed.

  Moreover, according to one form of the method for converting the measured value of the temperature sensitive resistance element disclosed in the present specification into the wind speed, the structure of the wind speed sensor can be simplified.

  The objects and advantages of the invention will be realized and obtained by means of the elements and combinations particularly pointed out in the appended claims.

  Both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention as claimed.

1 is a diagram illustrating a first embodiment of a wind speed sensor system disclosed in this specification. FIG. It is a figure explaining the wind speed sensor of the wind speed sensor system of FIG. It is a figure explaining the computer of the wind speed sensor system of FIG. It is a figure which shows the wind speed by which the measured value of the temperature sensitive resistance element was converted by the wind speed sensor system of 1st Embodiment, and the measured value of a wind speed. It is a figure which shows the measured value of the wind speed by which the measured value of the temperature sensitive resistance element was converted by the modification of 1st Embodiment, and a wind speed. It is a figure which shows the measured value of the wind speed by which the measured value of the temperature sensitive resistance element was converted by the wind speed sensor system of 2nd Embodiment of the wind speed sensor system disclosed to this specification, and the wind speed. It is a figure which shows the wind speed sensor of 3rd Embodiment of the wind speed sensor system disclosed to this specification. It is a figure which shows 4th Embodiment of the wind speed sensor system disclosed to this specification. It is a figure which shows the example which formed the wind speed sensor system using the wind speed sensor by the conventional example.

  Hereinafter, a preferred first embodiment of a wind speed sensor system disclosed in this specification will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, but extends to the invention described in the claims and equivalents thereof.

  FIG. 1 is a diagram showing a first embodiment of a wind speed sensor system disclosed in this specification. FIG. 2 is a diagram illustrating a wind speed sensor of the wind speed sensor system of FIG. FIG. 3 is a diagram illustrating a computer of the wind speed sensor system of FIG.

As shown in FIG. 1, the wind speed sensor system 20 of the present embodiment includes a first temperature sensitive resistance element 21 a that is sensitive to wind speed and a second temperature sensitive resistance element 21 b that is sensitive to temperature. Is provided. The wind speed sensor system 20 also includes a first elementary function f ₁ having the measured value V ₁ of the first temperature sensitive resistance element 21a as an independent variable and a first elementary function f ₁ having the measured value V ₂ of the second temperature sensitive resistance element as an independent variable. 2 and elementary functions f _2, using the measurement value conversion expression with, comprises a computer 40 for converting the measured values of the temperature sensitive resistive element to wind speed ws.

  The wind speed sensor system 20 is used, for example, for measuring the wind speed of an airflow in a room.

  Next, the wind speed sensor 20 will be described below with reference to FIG.

  The first temperature-sensitive resistance element 21a and the second temperature-sensitive resistance element 21b have characteristics that the electrical resistance changes greatly with respect to temperature changes. As the first temperature-sensitive resistance element 21a and the second temperature-sensitive resistance element 21b, for example, a thermistor can be used.

  As shown in FIG. 2, the wind speed sensor 20 includes a drive detection circuit unit 30 that drives the first temperature-sensitive resistance element 21 a and the second temperature-sensitive resistance element 21 b and outputs measurement values based on the respective resistance values.

  The drive detection circuit unit 30 includes a constant current circuit 31a as a power supply source that supplies power to the first temperature sensing resistor element 21a, and a constant voltage circuit as a power supply source that supplies power to the second temperature sensing resistor element 21b. 31b.

  Further, the drive detection circuit unit 30 includes a DC circuit 32 that receives power supplied from external power and supplies DC power to the constant current circuit 31a and the constant voltage circuit 31b.

  Further, the drive detection circuit unit 30 divides the voltage change accompanying the resistance change of the resistor 35a for taking out the voltage change accompanying the resistance change of the first temperature sensing resistor element 21a as a divided voltage and the resistance change of the second temperature sensing resistor element 21b. And a resistor 35b for taking out as a pressure. Each of the resistor 35a and the resistor 35b is grounded.

Furthermore, the drive detection circuit 30 includes an operational amplifier 33a for amplifying the partial pressure taken out by the resistance 35a, an A / D converter 34 to the output voltage V ₁ of the operational amplifier 33a is converted from an analog value to a digital value. The drive detection circuit unit 30 outputs the digital signal output from the A / D converter 34 to the computer 40 as the measured value V ₁ of the wind speed by the first temperature-sensitive resistance element 21a.

Similarly, the drive detection circuit unit 30 includes an operational amplifier 33b that amplifies the divided voltage extracted using the resistor 35b. A / D converter 34 converts the output voltage V ₂ of the operational amplifier 33b from an analog value to a digital value. The drive detection circuit unit 30 outputs the digital signal output from the A / D converter 34 to the computer 40 as a temperature measurement value V ₂ by the second temperature-sensitive resistance element 21b.

  The drive detection circuit unit 30 uses the constant current circuit 31a to drive the first temperature sensing resistor element 21a with a current that causes the first temperature sensing resistor element 21a to generate a little heat. That is, the temperature of the first temperature sensitive resistance element 21a is preferably higher than the ambient temperature. For example, the temperature of the first temperature-sensitive resistance element 21a is preferably higher by 5 ° C. or more than the ambient temperature.

  In addition, the drive detection circuit 30 causes the current to be smaller than the current flowing through the first temperature sensing resistor element 21a using the constant voltage circuit 31b, and generates heat smaller than the first temperature sensing resistor element. In this manner, the second temperature sensitive resistance element 21b is driven. The temperature of the second temperature sensitive resistance element 21b is substantially the same as the ambient temperature. The difference between the temperature of the second temperature sensitive resistance element 21b and the ambient temperature is preferably within 1 ° C., for example. In the present specification, the fact that the temperature of the second temperature sensitive resistance element 21b is within 1 ° C. relative to the ambient temperature is also referred to as the temperature of the second temperature sensitive resistance element 21b being the same as the ambient temperature.

  The first temperature-sensitive resistance element 21a having a temperature higher than the ambient temperature is exposed in the measurement airflow, and since the heat is taken away by exposure to the airflow, the resistance value changes. In addition, the resistance value of the first temperature-sensitive resistance element 21a changes depending on the temperature of the first temperature-sensitive resistance element 21a even when the ambient temperature varies.

On the other hand, the second temperature-sensitive resistance element 21b having the same temperature as the ambient temperature is exposed in the measurement airflow, but is hardly affected by the airflow, and thus is influenced only by the temperature of the airflow. Therefore, the resistance value of the second temperature-sensitive resistance element 21b changes mainly due to changes in the temperature of the surroundings or the airflow. That is, the second temperature sensitive resistance element 21b is sensitive to temperature. The wind speed sensor system 10 can measure the temperature using the measured value V2 of the _second temperature-sensitive resistance element 21b.

The wind speed sensor system 10 measures the wind speed by using the amount of change in the resistance value of the first temperature sensitive resistance element 21a and the second temperature sensitive resistance element 21b. Since the measured value V ₁ by the first temperature sensitive resistance element 21a changes under the influence of both the wind speed and the temperature, it is difficult to calculate the wind speed only by the first temperature sensitive resistance element 21a. Therefore, the wind speed sensor system 10 measures the temperature by using the measured value V ₂ of the second temperature sensitive resistive element 21b sensitive to temperature. The wind speed sensor system 10 uses the temperature, by compensating the effect of temperature on the measurement value V ₁ of the first temperature sensitive resistor element 21a, and calculates the wind velocity. That is, the measured value V ₁ of the first temperature sensitive resistor element 21a, the first temperature sensitive resistor element 21a can be said to have a sensitivity to the wind speed.

  Next, the computer 40 will be described below with reference to FIG.

The computer 40 uses a measurement value conversion equation having a first elementary function f ₁ and a second elementary function f _2, and a calculation unit 41 for performing a calculation for converting the measurement value of the temperature sensitive resistance element into the wind speed, and the measurement value It has the memory | storage part 42 which memorize | stores a conversion type | formula, the input part 43, and the output part 44. FIG. In addition, the computer 40 includes a communication unit 45 that performs communication with the wind speed sensor 20.

  The calculation unit 41 is formed using a central processing unit (CPU), a numerical calculation processor, a digital signal processor (DSP), or the like. The storage unit 42 is formed using a semiconductor storage device, a storage device using a storage medium, or the like. The calculation unit 41 executes the program stored in the storage unit 42 to convert the measurement value of the temperature sensitive resistance element into the wind speed using the measurement value conversion formula.

  The input unit 43 is formed using a keyboard, a mouse, or the like. The output unit 44 is formed using a liquid crystal display, a CRT, a printer, or the like. The communication unit 45 communicates with the wind speed sensor 20 using wired or wireless. The communication unit 45 may communicate with the wind speed sensor 20 via a network.

  Next, the measurement value conversion formula stored in the storage unit 42 will be described below.

As described above, the measured value conversion equation includes the first elementary function f ₁ having the measured value V ₁ of the first temperature-sensitive resistance element 21a having sensitivity to the wind speed as an independent variable and the second temperature sensitivity having sensitivity to temperature. A second elementary function f ₂ having the measured value V ₂ of the resistance element 21b as an independent variable.

Specifically, the first elementary function f ₁ or the second elementary function f ₂ is a triangular function such as a linear function of measurement values or a higher-order function of second or higher order, a polynomial function, an exponential function, a logarithmic function, or a tangent function. A function, a hyperbolic function, or the like.

The measured value conversion equation may further include a third elementary function f ₃ having the measured value V ₂ of the second temperature sensitive resistance element 21b as an independent variable.

The wind speed sensor system 10 uses the following formula (1) as a measured value conversion formula for converting the wind speed ws from the measured value of the temperature-sensitive resistance element.
ws = f ₃ (V ₂ ) × f ₁ (f ₂ (V ₂ ) × V ₁ ) (1)
Here, V ₁ is a measured value of the first temperature-sensitive resistance element 21a, V ₂ is a measured value of the second temperature-sensitive resistance element 21b, f ₁ is a first elementary function, and f ₂ is a second value. It is an elementary function, and f ₃ is a third elementary function.

In the above formula (1), the first elementary function f ₁ uses the measured value V _{1 of} the first temperature-sensitive resistance element 21a and the value of the second elementary function f ₂ as independent variables. Specifically, the first elementary function f ₁ uses a product of the measured value V _{1 of} the first temperature sensitive resistance element 21a and the value of the second elementary function f ₂ as a variable.

  For example, the resistance value of a thermistor that is a temperature-sensitive resistance element changes logarithmically with respect to temperature. In a circuit in which this thermistor is incorporated into a constant current type circuit, if the output voltage due to a change in resistance of the thermistor with respect to a temperature change is calculated analytically, the logarithmic function part of the thermistor has a complicated structure and an accurate analytical solution is obtained. Is difficult. Further, in an actual wind speed sensor, the thermistor is affected by the shape and arrangement of the thermistor and the shape elements such as the hood and case around the thermistor. Therefore, it is very difficult to analytically determine the output voltage of the thermistor whose resistance value has changed due to the change in temperature due to exposure to airflow.

Therefore, in the wind speed sensor system 10, the measurement of the wind speed sensor is performed using the measurement value conversion equation (1) including the first elementary function f ₁ , the second elementary function f ₂ , and the third elementary function f _3. The wind speed was converted from the value. For example, when a thermistor is used as the temperature sensitive resistance element, since there is an exponential relationship between the voltage value change due to the resistance change of the thermistor and the wind speed, it is preferable to use an exponential function as an elementary function. In particular, it is preferable to use an exponential function with the Napier number as the base.

FIG. 4 is a diagram showing the wind speed ws obtained by converting the measured value of the temperature sensitive resistance element by the wind speed sensor system 10 of the present embodiment and the actual measured value of the wind speed. The horizontal axis of FIG. 4 shows the voltage that is the measured value V ₁ of the first temperature-sensitive resistance element 21a. The vertical axis in FIG. 4 indicates the wind speed ws. The curve in FIG. 4 is the wind speed calculated using the measured value conversion formula, and is calculated every 5 ° C. in the range of the ambient temperature from 20 ° C. to 60 ° C. using the temperature as a parameter. Moreover, the plot in FIG. 4 is an actual measurement value of the wind speed at each temperature. The actual measurement value of the wind speed is a value measured using another calibrated wind speed sensor. A thermistor was used as the first temperature sensitive resistance element 21a and the second temperature sensitive resistance element 21b.

In calculating the wind speed in FIG. 4, an exponential function based on the Napier number is used as the first elementary function f ₁ . That is, the above formula (1) is rewritten as the following formula (2).
f ₁ = f ₃ (V ₂ ) × exp (f ₂ (V ₂ ) × V ₁ ) (2)

Moreover, the following polynomial was used as the second elementary function f ₂ and the third elementary function f ₃ .
f ₂ (V ₂ ) = a ₁ V ₂ ² + a ₂ V ₂ + a ₃ ,
f ₃ (V ₂ ) = a ₄ V ₂ ² + a ₅ V ₂ + a _{6,
Here, a 1, a 2, a} 3, a 4, a 5, and a ₆ are coefficients.

In the above formulas (1) and (2), the first elementary function f ₁ (f ₂ (V ₂ ) × V ₁ ) mainly gives the overall shape of the curve with respect to the horizontal axis V ₁ . The second elementary function f ₂ (V ₂ ) mainly gives the pitch between the curves due to the difference in temperature. Furthermore, the third elementary function f ₃ (V ₂ ) affects the temperature of each curve shape.

The coefficients a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , and a ₆ are obtained by, for example, obtaining a difference between the measured value and the calculated value of the wind speed and optimizing the coefficient by the least square method, etc. It is obtained by using.

  As shown in FIG. 4, in the wind speed sensor system 10, good agreement is found between the wind speed ws calculated using the above equation (2) and the measured value of the wind speed at each temperature.

  According to the theory which does not consider the influence of a shape, the space | interval between curves of different temperature becomes equal intervals. However, actually, as shown in the plot of the actual measurement value of the wind speed in FIG. 4, there is an unequal interval between the curves due to the influence of the shape described above. And the wind speed sensor system 10 is calculating | requiring the calculated value of the wind speed ws accurately including the influence of this shape.

In the above formula (2), in particular, by using an exponential function based on the number of Napiers as the first elementary function f ₁ , and using the second elementary function f ₂ and the third elementary function f ₃ that are polynomials, From the measured values V ₁ and V ₂ , it is possible to accurately convert the wind speed that varies unevenly with respect to the temperature.

  According to the wind speed sensor system 10 of the present embodiment described above, since only a single measurement value conversion equation is used, a correspondence table for converting the wind speed from the measurement value of the temperature-sensitive resistance element used in the conventional wind speed sensor becomes unnecessary. Wind speed can be measured at high speed. Further, a large memory capacity for storing these correspondence tables is also unnecessary.

Further, according to the wind speed sensor system 10, the wind speed can be obtained by using the measured value conversion equation having the measured values V ₁ and V ₂ of the wind speed sensor as independent variables, so that the structure of the wind speed sensor can be simplified.

  Therefore, according to the wind speed sensor system 10, since the structure of the wind speed sensor is simplified and a large memory capacity is unnecessary, the manufacturing cost of the wind speed sensor system can be reduced.

  FIG. 5 is a diagram showing the wind speed obtained by converting the measured value of the temperature sensitive resistance element according to the modification of the first embodiment described above and the actual measured value of the wind speed.

In the present modification, the degree of coincidence between the wind speed ws calculated using the above formula (2) and the measured value of the wind speed is improved around 20 ° C. and 60 ° C. at both ends of the temperature range. , Coefficients a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , and a ₆ are changed.

In this way, the above equation (2) is used by optimizing the coefficients a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , and a ₆ particularly in the temperature range where the accuracy of the wind speed is required. The degree of coincidence between the calculated wind speed ws and the actual measured wind speed can be further improved.

  Next, the wind speed sensor system of 2nd-4th embodiment disclosed by this specification is demonstrated below, referring drawings. Regarding points that are not particularly described in the second to fourth embodiments, the description in detail regarding the first embodiment is applied as appropriate. Moreover, in FIG.7 and FIG.8, the same code | symbol is attached | subjected to the same component as FIGS. 1-3.

In the wind speed sensor system 10 of the second embodiment, the measured value conversion formula for converting the wind speed ws from the measured value of the temperature sensitive resistance element is further measured by the second temperature sensitive resistance element 21b with respect to the formula (1). comprises a fourth elementary function f ₄ that the value V ₂ as independent variables, the fifth elementary function f ₅ for an independent variable measurements V ₂ of the second temperature sensitive resistor element 21b, a.

Specifically, the wind speed sensor system 10 uses the following formula (3) as a measured value conversion formula for converting the wind speed ws from the measured value of the temperature-sensitive resistance element.
ws = f ₃ (V ₂ ) × f ₁ (f ₂ (V ₂ ) × V ₁ + f ₄ (V ₂ )) + f ₅ (V ₂ ) (3)
Here, V ₁ is a measured value of the first temperature sensitive resistance element, V ₂ is a measured value of the second temperature sensitive resistance element, f ₁ is a first elementary function, and f ₂ is a second elementary function. F ₃ is a third elementary function, f ₄ is a fourth elementary function, and f ₅ is a fifth elementary function.

In the above equation (3), the first elementary function f ₁ (f ₂ (V ₂ ) × V ₁ + f ₄ (V ₂ )) is the fourth elementary class together with the second elementary function f ₂ (V ₂ ) in the variable part. Since the function f ₄ (V ₂ ) is included, the pitch accuracy between the curves due to the difference in temperature is improved. Further, the above formula (3) also has the fifth elementary function f ₅ (V ₂ ), so that the accuracy of the pitch between the curves due to the difference in temperature is improved.

  The other structure of the wind speed sensor system 10 of this embodiment is the same as that of 1st Embodiment mentioned above.

FIG. 6 is a diagram comparing the wind speed ws obtained by converting the measured value of the temperature sensitive resistance element by the wind speed sensor system 10 of the present embodiment and the measured value of the wind speed. The horizontal axis of FIG. 6 shows the voltage that is the measured value V ₁ of the first temperature-sensitive resistance element 21a. The vertical axis in FIG. 6 indicates the wind speed ws. The curve in FIG. 6 is the wind speed calculated using the above formula (3), and is calculated every 5 ° C. in the range of 20 ° C. to 60 ° C. with the temperature as a parameter.

In calculating the wind speed of FIG. 6, an exponential function with the Napier number as the base was used as the first elementary function f ₁ . That is, the above equation (3) is rewritten as the following equation (4).
ws = f ₃ (V ₂ ) × exp (f ₂ (V ₂ ) × V ₁ + f ₄ (V ₂ )) + f ₅ (V ₂ ) (4)

Further, the following polynomial was used as the second elementary function f ₂ , the third elementary function f ₃ , the fourth elementary function f ₄ , and the fifth elementary function f ₅ .

f ₂ (V ₂ ) = b ₁ × exp (b ₂ × V ₂ + b ₃ ) + b ₄ ,
f ₃ (V ₂ ) = b ₅ × V ₂ ² −b ₆ × V ₂ + b ₇ ,
f ₄ (V ₂ ) = b ₈ × exp (b ₉ × V ₂ ),
f ₅ (V ₂ ) = b ₁₀
It is. b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , b ₆ , b ₇ , b ₈ , b ₉ and b ₁₀ are coefficients.

Coefficients b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , b ₆ , b ₇ , b ₈ , b _9, and b ₁₀ are obtained by, for example, obtaining the difference between the measured value and the calculated value of the wind speed, It is obtained by using a method of optimizing the coefficient by the least square method.

  As shown in FIG. 6, the wind speed sensor system 10 shows a very good match between the wind speed ws calculated using the above equation (4) and the measured value of the wind speed at each temperature. For example, in FIGS. 4 and 5, a slight deviation is found between the calculated wind speed ws and the actual measurement value depending on the temperature. However, in this embodiment, such a deviation is not seen.

In the above formula (4), in particular, as the three elementary function f _1, f _2, f _4, together with the use of the exponential function to the base Napier number, by using the elementary functions f ₃ is a polynomial, the measured value V _{From 1} and V ₂ , the wind speed that varies unevenly with respect to temperature can be converted with high accuracy. In particular, by using an exponential function based on the number of Napiers as the second elementary function f ₂ , which is one of the independent variables of the first elementary function f ₁ , the pitch between the curves due to the difference in temperature is accurately expressed. be able to.

According to the wind speed sensor system 10 of the present embodiment described above, the conversion accuracy from the measured values V ₁ and V _{2 of the} temperature sensitive resistance element to the wind speed can be further improved. Further, the same effect as that of the first embodiment described above can be obtained.

In the above formula (4), a constant is used as the fifth elementary function f _5. However, the fifth elementary function f ₅ may be an elementary function having the measured value V ₂ that is not a constant as an independent variable.

  FIG. 7 is a diagram illustrating a wind speed sensor according to a third embodiment of the wind speed sensor system disclosed in this specification.

  The wind speed sensor system 10 of the present embodiment is different from the above-described embodiments in the structure of the wind speed sensor 20.

  Specifically, as shown in FIG. 7, the wind speed sensor 20 includes a first temperature sensitive resistance element 21a sensitive to wind speed and a second temperature sensitive resistance element 21b sensitive to temperature, and a first temperature sensitive resistance element 21b sensitive to temperature. It has 3 temperature sensitive resistance elements 21c.

Similarly to the first embodiment shown in FIG. 2, the drive detection circuit unit 30 of the wind speed sensor 20 includes a constant current circuit 31a, a constant voltage circuit 31b, a DC circuit 32, operational amplifiers 33a and 33b, and an A / D converter. 34 and resistors 35a and 35b. The drive detection circuit unit 30 drives the first temperature-sensitive resistance element 21a and the second temperature-sensitive resistance element 21b as in the first embodiment. The driving detector circuit part 30 outputs the measured value V ₁ of the wind speed by the first temperature sensitive resistor element 21a, the measured value V ₂ of the temperature by the second temperature sensitive resistor element 21b, to the outside.

  Further, as shown in FIG. 7, the drive detection circuit unit 30 includes a constant voltage circuit 31c as a power supply source that supplies power to the third temperature-sensitive resistance element 21c. DC power is supplied from the DC circuit 32 to the constant voltage circuit 31c.

  Further, the drive detection circuit unit 30 includes a resistor 35c for taking out a voltage change accompanying a resistance change of the third temperature sensitive resistance element 21c as a divided voltage. The resistor 35c is grounded.

Further, the drive detection circuit unit 30 includes an operational amplifier 33c that amplifies the divided voltage extracted using the resistor 35c. A / D converter 34 converts the output voltage V ₃ of the operational amplifier 33c from an analog value to a digital value. The drive detection circuit unit 30 outputs the digital signal output from the A / D converter 34 to the computer 40 as a temperature measurement value V ₃ by the third temperature-sensitive resistance element 21c.

  Using the constant voltage circuit 31c, the drive detection circuit 30 drives the third temperature sensing resistor element 21c by passing a current that is smaller than the current that flows through the first temperature sensing resistance element 21a. The temperature of the third temperature sensitive resistance element 21c is the same as the ambient temperature, like the second temperature sensitive resistance element 21b.

Although the third temperature-sensitive resistance element 21c having the same temperature as the ambient temperature is exposed in the measurement airflow, it is hardly affected by the airflow, and thus is influenced only by the temperature of the airflow. Therefore, the resistance value of the third temperature-sensitive resistance element 21c changes mainly due to changes in the temperature of the surroundings or the airflow. That is, the measured value V ₃ of the _third temperature sensitive resistance element 21c is sensitive to temperature.

Wind sensor system 10, using the average value of the measurement values V ₃ of the measurement values V ₂ and the third temperature sensitive resistor element 21c of the second temperature sensitive resistive element 21b that is sensitive to temperature, to measure the temperature. Then, the wind speed sensor system 10 calculates the wind speed by compensating for the influence of the temperature on the measured value V ₁ of the first temperature-sensitive resistance element 21a having sensitivity to the wind speed using the average value of the temperature.

Wind sensor system 10, the average value V ₄ of the measurement values V ₃ of the measurement values V ₂ and the third temperature sensitive resistor element 21c of the second temperature sensitive resistor element 21b,
V ₄ = (V ₂ + V ₃ ) / 2
Is used. The wind speed sensor system 10, in the above-mentioned formula (1) to (4) or the like of the measurement value conversion expression using a mean value V ₄ instead of the measurement value V _2.

  As described above, in the wind speed sensor system 10, the temperature is obtained using the measured value based on the resistance value averaged by the second temperature sensitive resistance element 21b and the third temperature sensitive resistance element 21c. Variations in measured values due to individual differences in temperature resistance elements are reduced.

According to the wind speed sensor system 10 of the present embodiment described above, the influence of the temperature can be compensated more accurately with respect to the measured value V _{1 of} the first temperature-sensitive resistance element 21a having sensitivity to the wind speed, so that the wind speed is more accurate. Calculated well.

  Moreover, according to the wind speed sensor system 10, the effect similar to 1st Embodiment mentioned above is acquired.

  FIG. 8 is a diagram illustrating a fourth embodiment of a wind speed sensor system disclosed in this specification.

  The wind speed sensor system 10 according to the present embodiment includes a plurality of wind speed sensors 20 that are distributed in an indoor space. As the wind speed sensor 20, the wind speed sensor of the 1st-3rd embodiment mentioned above can be used, for example.

  Further, the wind speed sensor system 10 includes a server 51 as a computer that converts each of the input measurement values of the plurality of wind speed sensors 20 into a wind speed using the same measurement value conversion formula. The server 51 can use, for example, the same formula as the wind speed sensor system of the first to third embodiments described above as the measurement value conversion formula for converting the measurement value into the wind speed.

  In the wind speed sensor system 10, each wind speed sensor 20 transmits the measured value measured by the temperature-sensitive resistance element to the repeaters 54a and 54b without converting into the wind speed. The measurement values input to the relay devices 54 a and 54 b are input to the server 51 via the upper relay device 55. The server 51 converts the measurement value transmitted from each wind speed sensor 20 into the wind speed using the same measurement value conversion formula.

  Moreover, the wind speed sensor system 10 measures temperature using the measured value of the temperature sensitive resistance element which has sensitivity to the temperature in a wind speed sensor.

  The wind speed sensor system 10 includes a plurality of air conditioners 52 that are controlled by the server 51 using the measured values of wind speed and temperature. Further, the wind speed sensor system 10 includes a plurality of air flow controllers 53 that are controlled by the server 51 using the measured values of the wind speed and temperature. From the viewpoint described above, each wind speed sensor 20 is preferably arranged at each point in the room so as to measure a wind speed distribution and a temperature distribution for efficiently controlling the air conditioner 52 and the airflow controller 53.

  The wind speed sensor system 10 can be used as a system for controlling the air conditioner 52 and the airflow controller 53 in a large room such as a factory, a data center, a building, an office, a farm, and a store.

  In order to efficiently control air conditioning in a wide room, it is preferable to measure the wind speed at a number of points. From such a viewpoint, the wind speed sensor system 30 preferably includes 10 or more, 100 or more, or 1000 or more, or 10,000 or more, or 100,000 or more. By using a large number of wind speed sensors in this way, for example, even if there are variations in measured values due to individual differences in the wind speed sensors, the measured values are averaged. Will improve.

  Further, the wind speed sensor system 10 may use different measurement value conversion formulas for each indoor area without using the same measurement value conversion formulas for all the wind speed sensors 20. For example, in FIG. 8, the same measurement value conversion formula is used for the measured value of the wind speed sensor 20 in the area transmitted via the relay 54a, but the wind speed sensor of the area transmitted via the relay 54b. Another measurement value conversion formula may be used for the 20 measurement values.

  In the wind speed sensor system 10, when different types of wind speed sensors are used, different measurement value conversion formulas may be used for each type.

  FIG. 9 is a diagram showing an example in which a wind speed sensor system 110 is formed using a conventional wind speed sensor. The wind speed sensor system 110 includes a plurality of wind speed sensors 120 that transmit the wind speed measured using the temperature-sensitive resistance element to the server 151, and the server 151. Since each wind speed sensor 120 has a correspondence table for converting the wind speed from the measurement value measured by the temperature-sensitive resistance element, it has a large memory capacity for storing this correspondence table.

  When wind speed sensors are arranged at a large number of points, a memory for storing a correspondence table in each wind speed sensor and a circuit for storing and referring to measurement values in the memory are provided. It is necessary to provide a large number of memories and circuits. Therefore, the structure of the wind speed sensor system 110 becomes complicated, and the cost is remarkably increased.

  According to the wind speed sensor system 10 of the present embodiment described above, since each wind speed sensor 20 does not have a correspondence table, the structure is simple and the cost can be reduced.

  Further, according to the wind speed sensor system 10, the server 51 only converts the measurement value transmitted from the wind speed sensor 20 into the wind speed using the measurement value conversion formula, so that the wind speed is high-speed using a large number of wind speed sensors 20. Can be measured.

  In this invention, the wind speed sensor system of each embodiment mentioned above can be changed suitably, unless it deviates from the meaning of this invention.

  For example, in each of the embodiments described above, the wind speed sensor has one temperature-sensitive resistance element that is sensitive to wind speed, but the wind speed sensor has two or more temperature-sensitive resistance elements that are sensitive to wind speed. You may do it.

  In each of the above-described embodiments, the wind speed sensor has one or two temperature sensitive resistance elements that are sensitive to temperature. However, the wind speed sensor has two temperature sensitive resistance elements that are sensitive to temperature. You may have more.

  Moreover, in each embodiment mentioned above, although the voltage was used as a measured value of a temperature sensitive resistance element, you may use an electric current as a measured value of a temperature sensitive resistive element.

  All examples and conditional words mentioned herein are intended for educational purposes to help the reader deepen and understand the inventions and concepts contributed by the inventor. All examples and conditional words mentioned herein are to be construed without limitation to such specifically stated examples and conditions. Also, such exemplary mechanisms in the specification are not related to showing the superiority and inferiority of the present invention. While embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions or modifications can be made without departing from the spirit and scope of the invention.

  Regarding the above-described embodiments, the following additional notes are disclosed.

(Appendix 1)
A first elementary function having the measured value of the first temperature sensitive resistance element as an independent variable;
A second elementary function with the measured value of the second temperature sensitive resistance element as an independent variable;
A method of converting a measured value of a temperature-sensitive resistance element into a wind speed using a measured value conversion equation comprising:

(Appendix 2)
The method according to appendix 1, wherein the first elementary function uses the measured value of the first temperature sensitive resistance element and the value of the second elementary function as independent variables.

(Appendix 3)
The method according to appendix 2, wherein the first elementary function uses a product of a measured value of the first temperature sensitive resistance element and a value of the second elementary function as a variable.

(Appendix 4)
The method according to any one of appendices 1 to 3, wherein the first elementary function and the second elementary function are exponential functions based on a Napier number.

(Appendix 5)
The measured value conversion equation further includes a third elementary function having the measured value of the second temperature sensitive resistance element as an independent variable,
The measurement value conversion formula is:
Wind speed = f ₃ (V ₂ ) × f ₁ (f ₂ (V ₂ ) × V ₁ )
And where
V ₁ is a measured value of the first temperature sensitive resistance element,
V ₂ is a measured value of the second temperature sensitive resistance element,
f ₁ is the first elementary function,
f ₂ is the second elementary function,
f ₃ is the third elementary functions The method according to any one of Appendices 1 to 4.

(Appendix 6)
The measured value conversion equation further includes a third elementary function having the measured value of the second temperature sensitive resistance element as an independent variable, and a fourth elementary function having the measured value of the second temperature sensitive resistance element as an independent variable. A fifth elementary function having the measured value of the second temperature-sensitive resistance element as an independent variable,
The measurement value conversion formula is:
Wind speed = f ₃ (V ₂ ) × f ₁ (f ₂ (V ₂ ) × V ₁ + f ₄ (V ₂ )) + f ₅ (V ₂ )
And where
V ₁ is a measured value of the first temperature sensitive resistance element,
V ₂ is a measured value of the second temperature sensitive resistance element,
f ₁ is the first elementary function,
f ₂ is the second elementary function,
f ₃ is the third elementary function,
f ₄ is the fourth elementary function,
f ₅ is the fifth elementary function, method according to any one of Appendices 1 to 4.

(Appendix 7)
A first temperature sensitive resistance element;
A second temperature sensitive resistance element;
A wind speed sensor having
A first elementary function having the measured value of the first temperature sensitive resistance element as an independent variable;
A second elementary function having the measured value of the second temperature sensitive resistance element as an independent variable;
A computer that converts the measured value of the temperature-sensitive resistance element into the wind speed using a measured value conversion formula having:
A wind speed sensor system comprising:

(Appendix 8)
Driving the first temperature sensitive resistance element to generate a temperature higher than the ambient temperature, outputting a measured value based on the resistance value of the first temperature sensitive resistance element; and
The second temperature sensitive resistance element is driven to generate heat smaller than the first temperature sensitive resistance element, and has a drive detection circuit unit that outputs a measurement value based on the resistance value of the second temperature sensitive resistance element. The wind speed sensor system according to appendix 7.

(Appendix 9)
A plurality of wind speed sensors distributed in an indoor space;
A computer that converts each of the input measurement values of the plurality of wind speed sensors into wind speed using the same measurement value conversion formula;
With
The wind speed sensor has a first temperature sensitive resistance element and a second temperature sensitive resistance element,
The measured value conversion equation includes: a first elementary function having a measured value of the first temperature sensitive resistance element as an independent variable; and a second elementary function having a measured value of the second temperature sensitive resistance element as an independent variable. A wind speed sensor system.

DESCRIPTION OF SYMBOLS 10 Wind speed sensor system 20 Wind speed sensor 21a 1st temperature sensitive resistance element 21b 2nd temperature sensitive resistance element 21c 3rd temperature sensitive resistance element 30 Drive detection circuit part 31a Constant current circuit 31b, 31c Constant voltage circuit 32 DC circuit 33a, 33b, 33c operational amplifier 34 A / D converter 35a, 35b, 35c resistance 40 computer 41 arithmetic unit 42 storage unit 43 input unit 44 output unit 45 communication unit 51 server 52 air conditioner 53 air flow controller 54 repeater 55 upper relay device

Claims (7)

A first elementary function having the measured value of the first temperature sensitive resistance element as an independent variable;
A second elementary function with the measured value of the second temperature sensitive resistance element as an independent variable;
A method of converting a measured value of a temperature-sensitive resistance element into a wind speed using a measured value conversion equation comprising:   2. The method according to claim 1, wherein the first elementary function uses the measured value of the first temperature sensitive resistance element and the value of the second elementary function as independent variables.   The method according to claim 1 or 2, wherein the first elementary function and the second elementary function are exponential functions with a Napier number as a base. The measured value conversion equation further includes a third elementary function having the measured value of the second temperature sensitive resistance element as an independent variable,
The measurement value conversion formula is:
Wind speed = f ₃ (V ₂ ) × f ₁ (f ₂ (V ₂ ) × V ₁ )
And where
V ₁ is a measured value of the first temperature sensitive resistance element,
V ₂ is a measured value of the second temperature sensitive resistance element,
f ₁ is the first elementary function,
f ₂ is the second elementary function,
f ₃ is the third elementary functions A method according to any one of claims 1 to 3. The measured value conversion equation further includes a third elementary function having the measured value of the second temperature sensitive resistance element as an independent variable, and a fourth elementary function having the measured value of the second temperature sensitive resistance element as an independent variable. A fifth elementary function having the measured value of the second temperature-sensitive resistance element as an independent variable,
The measurement value conversion formula is:
Wind speed = f ₃ (V ₂ ) × f ₁ (f ₂ (V ₂ ) × V ₁ + f ₄ (V ₂ )) + f ₅ (V ₂ )
And where
V ₁ is a measured value of the first temperature sensitive resistance element,
V ₂ is a measured value of the second temperature sensitive resistance element,
f ₁ is the first elementary function,
f ₂ is the second elementary function,
f ₃ is the third elementary function,
f ₄ is the fourth elementary function,
f ₅ is the fifth elementary function, method according to any one of claims 1 to 3. A first temperature sensitive resistance element;
A second temperature sensitive resistance element;
A wind speed sensor having
A first elementary function having the measured value of the first temperature sensitive resistance element as an independent variable;
A second elementary function having the measured value of the second temperature sensitive resistance element as an independent variable;
A computer that converts the measured value of the temperature-sensitive resistance element into the wind speed using a measured value conversion formula having:
A wind speed sensor system comprising: A plurality of wind speed sensors distributed in an indoor space;
A computer that converts each of the input measurement values of the plurality of wind speed sensors into wind speed using the same measurement value conversion formula;
With
The wind speed sensor has a first temperature sensitive resistance element and a second temperature sensitive resistance element,
The measured value conversion equation includes: a first elementary function having a measured value of the first temperature sensitive resistance element as an independent variable; and a second elementary function having a measured value of the second temperature sensitive resistance element as an independent variable. A wind speed sensor system.

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