Floor heating controller

Abstract

To provide a floor heating controller capable of keeping an error of determined room temperature within an allowable range even in a wall embedded controller receiving an influence of disturbance caused by outdoor temperature change.SOLUTION: A floor heating controller 1 includes: a first temperature sensor 24 disposed in a rear portion 20 embedded in a wall W; a second temperature sensor 16 disposed on a control board 15 in a front portion 10; a third temperature sensor 17 disposed just inside of a ventilation port 18 separating from the control board 15; and relays A, B controlling supply power of heaters A, B, and further includes operation means estimating a room temperature by using present detection values and past detection values stored in a memory, of the first temperature sensor 24, the second temperature sensor 16, the third temperature sensor 17, an ON / OFF state of the relay A, and an ON / OFF state of the relay B.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The technology disclosed in this application relates to a floor heating controller that detects room temperature and controls the amount of heat generated. [Background technology]

[0002] Conventionally, a method for correcting a room temperature detected by a temperature sensor provided in a floor heating controller is disclosed in, for example, Patent Document 1.

[0003] Patent Document 1 discloses a method in which a calculation means detects the difference between a temperature signal from a first temperature sensor that detects the temperature inside a controller and a temperature signal from a second temperature sensor that detects the ambient temperature (exposed to the outside air), corrects the second temperature sensor based on the difference, and calculates a room temperature that is closer to the actual room temperature. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3162810 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0005] In floor heating systems, the controller that controls the room temperature to an appropriate value is generally embedded in about half of its housing between the inner and outer walls (hereafter abbreviated as "outdoor") so as not to disturb the occupants. Controllers embedded in the wall are strongly affected by disturbances caused by changes in the outdoor temperature.

[0006] The controller disclosed in Patent Document 1 is not embedded in a wall. Therefore, in a wall-embedded controller such as the one described above, which is subject to disturbances caused by changes in outdoor temperature, the temperature correction method disclosed in Patent Document 1 cannot be used, and there is a problem in that it is difficult to keep the room temperature error within an allowable range.

[0007] The technology disclosed in this application has been proposed in consideration of the above-mentioned problems, and aims to provide a floor heating controller that places three temperature sensors in locations with different temperature environments within the control, and determines room temperature using past and current measurement values ​​of each temperature sensor, as well as the ON / OFF state signal of the relay within the control, making it possible to keep the error within an acceptable range. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the floor heating controller of claim 1 is a wall-embedded floor heating controller that controls the indoor temperature, the controller comprising a first temperature sensor arranged at an internal position of the wall within the controller and detecting the temperature within the controller at that position, a second temperature sensor arranged on the indoor side outside the wall within the controller, in the center of the controller and detecting the temperature within the controller at that position, a third temperature sensor arranged on the indoor side outside the wall within the controller, in the outer periphery of the controller and detecting the temperature within the controller at that position, a memory that stores past detected temperatures of the first temperature sensor, the second temperature sensor and the third sensor detected multiple times at a predetermined time interval, and a heat-generating switching element that controls the temperature (by turning the current flowing to the heater ON / OFF), and is characterized in that the controller comprises a calculation means that estimates the room temperature using the past detected temperatures of the first temperature sensor, the second temperature sensor and the third temperature sensor stored in the memory, the current detected temperatures of each, and the ON / OFF state signal of the heat-generating switching element. Effect of the Invention

[0009] In the floor heating controller according to claim 1, in addition to the second temperature sensor located inside the controller, outside the wall, and in the center of the controller (where it is likely to become hotter than the room temperature), and the third temperature sensor located inside the controller, outside the wall, and in the outer periphery of the controller (where it is close to the room temperature), the first temperature sensor is located inside the wall (where it is likely to be affected by temperature changes outside), making it possible to estimate the room temperature while taking into account the influence of disturbances due to temperature changes outside. Furthermore, by using the past detection values ​​detected by these three temperature sensors at a predetermined time interval and the ON / OFF state signal of the heat-generating switching element (relay, etc.), which is a major cause of temperature changes inside the controller, it becomes possible to estimate the room temperature more accurately even in a wall-embedded controller that is affected by disturbances due to temperature changes outside the room, and it becomes possible to keep the error of the room temperature calculated by the calculation means (of the controller) within an allowable range. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1A is a front view and FIG. 1B is a side view of a floor heating controller according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a side perspective view of a floor heating controller installed in a wall. [Diagram 3] 1 is a diagram illustrating the internal circuitry of a floor heating controller. [Figure 4] 4 is a flowchart illustrating a procedure for room temperature control in the floor heating controller. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] First, a floor heating controller 1 according to one embodiment of the present invention will be described with reference to the drawings.

[0012] Fig. 1 shows the external appearance of the floor heating controller 1, (A) being a front view and (B) being a side view. The figure also shows the positions of the three temperature sensors (first temperature sensor 24, second temperature sensor 16, and third temperature sensor 17) that are a feature of the present invention. Fig. 2 is a side perspective view of the floor heating controller 1 embedded in the wall.

[0013] The floor heating controller 1 comprises a front part 10 and a rear part 20 provided contiguous to the rear side of the front part 10. As shown in Fig. 2, the floor heating controller 1 is installed in a wall W with the rear part 20 embedded in the wall W.

[0014] The front section 10 is equipped with a main body cover 11, an operation cover 14, and a power switch 19. As shown in FIG. 1B, a vent 18 that communicates with the indoor space is provided in the lower right side of the main body cover 11 as you face the front. The operation cover 14 is provided so as to be openable and closable, and is opened and closed using operation cover handles 14a, 14a on both sides. The front section 10 also houses a display device 12 that displays the operating state and room temperature, an operation panel 13 (located directly below the operation cover 14) for setting the temperature, switching between operations, setting the timer, and the like, and a control board 15 on which the display device 12, operation panel 13, and the like are mounted.

[0015] The rear section 20 is provided with a substantially box-shaped bottom cover 21. Inside the bottom cover 21, a power supply board 23 on which a power supply circuit and relays (relay A, relay B) described below are arranged is housed, and AC 100 / 200V power lines L1, L2 and a heater wire LH connected to heaters A and B for temperature-controlled floor heating are connected.

[0016] As shown in FIG. 1 and FIG. 2, of the three temperature sensors that are characteristic of the present invention, the first temperature sensor 24 is disposed on a relay board (not shown) disposed on the side of the power supply board 23 of the rear section 20, and is adapted to detect the temperature inside the rear section 20. The output value of the first temperature sensor 24 is input to the control board 15 in the front section 10. The second temperature sensor 16 is disposed on the control board 15 at approximately the center of the operation panel 13 below the front section 10, and is adapted to detect the temperature inside the front section 10. The third temperature sensor 17 is disposed on a relay board (not shown) disposed outside the control board 15, and is disposed immediately inside the vent 18 that is separated from the control board 15 by a partition wall (not shown). As a result, the third temperature sensor 17 communicates with the indoor space via the vent 18, and is adapted to detect a temperature close to the room temperature of the indoor space. In the floor heating controller 1 of this embodiment, the first temperature sensor 24, the second temperature sensor 16 and the third temperature sensor 17 use thermistors whose resistance values ​​change with temperature, but the temperature sensors are not limited to thermistors and other temperature sensors may be used.

[0017] As described above, in the floor heating controller 1 of this embodiment, in addition to the third temperature sensor 17 that detects a temperature close to the room temperature of the indoor space and the second temperature sensor 16 that detects the temperature in the front part 10 on the indoor space side, the first temperature sensor 24 is disposed in the rear part 20 embedded in the wall W, thereby estimating the room temperature including external disturbance factors due to temperature changes outside the room, making it possible to keep the error in the room temperature calculated by the calculation means (of the controller) within an acceptable range.

[0018] Next, we will explain the internal circuit of the floor heating controller 1. Figure 3 is a diagram showing the circuit configuration of the floor heating controller 1. Various parts other than those shown in the diagram are incorporated in the floor heating controller 1, but in order to explain the features of the present invention, only the main parts are shown in the diagram of Figure 3.

[0019] Commercial power of AC 100V or 200V is input to the power circuit in the power supply board 23 of the rear section 20 and to the relay A and relay B through the power supply lines L1 and L2. The power supply circuit outputs voltages to be supplied to the circuit that drives and controls the relay A and relay B in the power supply board 23, and voltages to be supplied to the arithmetic processing unit, display device 12, operation panel 13, first temperature sensor 24, second temperature sensor 16, third temperature sensor 17, etc. in the control board 15 in the front section 10. The arithmetic processing unit in the control board 15 processes values ​​input from the operation panel 13, first temperature sensor 24, second temperature sensor 16, third temperature sensor 17, etc., and outputs the operating state, room temperature, etc. to the display device 12, controls the ON / OFF of the relay A and relay B, and controls the power supplied to the heater A and heater B through the heater wire LH. The memory 25 stores data input from the operation panel 13, data being processed, data used when estimating the room temperature described below, etc., and outputs them to the arithmetic processing unit.

[0020] Next, there will be explained the procedure for room temperature control in the floor heating controller 1. Fig. 4 is a flow chart for explaining the procedure for room temperature control in the floor heating controller 1.

[0021] First, the power supply of the floor heating controller 1 is turned on (START). In step S1, the temperature T1 detected by the first temperature sensor 24 at the current time, the temperature T2 detected by the second temperature sensor 16, the temperature T3 detected by the third temperature sensor 17, the value of the ON / OFF state RA of the relay A (1 / 0), and the value of the ON / OFF state RB of the relay B (1 / 0) are acquired and stored. That is, the calculation processing unit in the control board 15 acquires these data (T1, T2, T3, RA, RB) at preset time intervals and stores them in the memory 25 as needed. In this embodiment, the data from 4 minutes ago and the data from 8 minutes ago are used for room temperature estimation, so that the data from at least the past 8 minutes is stored in the memory 25. After 8 minutes, the oldest data is erased, and the data stored in the memory 25 is replaced in order to store new data.

[0022] Next, in steps S2 and S3, it is determined whether "8 minutes or more have passed since startup" (S2) and "4 minutes or more have passed since startup" (S3). If it has been less than 4 minutes since the power was turned on, both steps S2 and S3 are NO (N), and the process proceeds to step S4. If it has been more than 4 minutes but less than 8 minutes since the power was turned on, step S2 is NO (N) and step S3 is YES (Y), and the process proceeds to step S5. Furthermore, if it has been 8 minutes since the power was turned on, both steps S2 and S3 are YES (Y), and the process proceeds to step S6.

[0023] In step S4, since four minutes have not yet elapsed since the power was turned on, "room temperature estimation using a five-variable linear function" is performed using five variables, namely, the temperature T1 detected by the first temperature sensor 24 at the current time, the temperature T2 detected by the second temperature sensor 16, the temperature T3 detected by the third temperature sensor 17, the ON / OFF state RA (1 / 0) of relay A, and the value (1 / 0) of the ON / OFF state RB of relay B, all of which were stored in memory 25 in step S1. These five variables are designated as X1 (T1), X2 (T2), X3 (T3), X4 (RA), and X5 (RB), and an estimated room temperature value T is calculated from the following equation (equation A), which is a five-variable linear function consisting of constants a0, a1, a2, a3, a4, and a5 calculated in advance and stored in memory 25.

[0024] T=a0+a1X1+a2X2+a3X3+a4X4+a5X5...(Formula A)

[0025] In step S5, since more than 4 minutes (less than 8 minutes) have passed since the power was turned on, “room temperature estimation using a 10-variable linear function” is performed using 10 variables, including the temperature T1 detected by the first temperature sensor 24 at the current time stored in memory 25 in step S1, the temperature T2 detected by the second temperature sensor 16, the temperature T3 detected by the third temperature sensor 17, the ON / OFF state RA(1 / 0) of relay A and the ON / OFF state RB value (1 / 0) of relay B, and the data T1(4), T2(4), T3(4), RA(4), and RB(4) from 4 minutes ago stored in memory 25. These 10 variables are X1(T1), X2(T2), X3(T3), X4(RA), X5(RB), X6(T1(4)), X7(T2(4)), X8(T3(4)), X9(RA(4)), and X10(RA(4)). An estimated value T of the room temperature is calculated from the following equation (Equation B), which is a 10-variable linear function consisting of constants b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, and b10 that have been calculated in advance and stored in memory 25.

[0026] T=b0+b1X1+b2X2...+b8X8+b9X9+b10X10...(Formula B)

[0027] In step S6, since 8 minutes or more have passed since the power was turned on, "room temperature estimation using a 15-variable linear function" is performed using 15 variables in total 15 data, namely, the temperature T1 detected by the first temperature sensor 24 at the current time, the temperature T2 detected by the second temperature sensor 16, the temperature T3 detected by the third temperature sensor 17, the ON / OFF state RA(1 / 0) of relay A, and the ON / OFF state RB value (1 / 0) of relay B, which were stored in memory 25 in step S1, the data T1(4), T2(4), T3(4), RA(4), and RB(4) from 4 minutes ago, which were stored in memory 25, and the data T1(8), T2(8), T3(8), RA(8), and RB(8) from 8 minutes ago, which were stored in memory 25. These 15 variables are X1(T1), X2(T2), X3(T3), X4(RA), X5(RB), X6(T1(4)), X7(T2(4)), X8(T3(4)), X9(RA(4)), X10(RA(4)), X11(T1(8)), X12(T2(8)), X13(T3(8)), X14(RA(8)), and X15(RA(8)). The estimated value T of the room temperature is calculated from the following equation (Equation C), which is a 10-variable linear function consisting of constants c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, and c15 that have been calculated in advance and stored in memory 25.

[0028] T=c0+c1X1+c2X2...+c14X14+c15X15...(Formula C)

[0029] Once the estimated room temperature value has been obtained in step S4, step S5, or step S6, the process proceeds to step S7. In step S7, the obtained estimated room temperature value T is compared with the upper limit target value of the set room temperature value that has been preset via the operation panel 13 and stored in memory 25. If the estimated room temperature value T obtained in step S4 or the like is greater than the upper limit target value of the set room temperature value (Y), the process proceeds to step S9, relay A and / or relay B are turned OFF to cut off the power supply to heater A and / or heater B, and the process returns to step S1. If the estimated room temperature value T obtained in step S4 or the like is equal to or less than the upper limit target value of the set room temperature value (N), the process proceeds to step S8.

[0030] In step S8, the calculated estimated room temperature value T is compared with the lower limit target value of the set room temperature value that has been preset by the operation panel 13 and stored in memory 25. If the estimated room temperature value T calculated in step S4 or the like is smaller than the lower limit target value of the set room temperature value (Y), proceed to step 10, turn on relay A and / or relay B to supply power to heater A and / or heater B, and return to step S1. If the estimated room temperature value T calculated in step S3 is equal to or greater than the lower limit target value of the set room temperature value (N, i.e., if the estimated room temperature value T is equal to or greater than the lower limit target value and equal to or less than the upper limit target value of the set room temperature value), return directly to step S1.

[0031] Returning to step S1, the current temperature T1 detected by the first temperature sensor 24, the temperature T2 detected by the second temperature sensor 16, the temperature T3 detected by the third temperature sensor 17, the value RA of the ON / OFF state of relay A (1 / 0), and the value RB of the ON / OFF state of relay B (1 / 0) are obtained and stored in memory 25.

[0032] As described above, the power supply to heaters A and B is increased or decreased by controlling relays A and B to be ON / OFF so that the room temperature estimated using the temperature T1 detected by the first temperature sensor 24, the temperature T2 detected by the second temperature sensor 16, the temperature T3 detected by the third temperature sensor 17, the value of the ON / OFF state RA of relay A (1 / 0), and the value of the ON / OFF state RB of relay B (1 / 0) is between the lower limit target value and the upper limit target value of the set room temperature.

[0033] Next, we will explain how to calculate the constants a0, a1, a2, a3, a4, and a5 in the "five-variable linear function" above. Here, the constants a0, a1, a2, a3, a4, and a5 are specific to the target floor heating controller, and in this embodiment, before controlling the room temperature with the floor heating controller 1, a separate room temperature meter is used to calculate the constants a0, a1, a2, a3, a4, and a5 in the following procedure.

[0034] At a predetermined time interval, n times, time series data of the first temperature sensor 24, the second temperature sensor 16, the third temperature sensor 17, the ON / OFF state of relay A (1 / 0), the ON / OFF state of relay B (1 / 0), and the actual measured value F of the room temperature gauge are acquired. The time series data of the first temperature sensor 24 (X11, . . ., X1n), the time series data of the second temperature sensor 16 (X21, . . ., X2n), the time series data of the third temperature sensor 17 (X31, . . ., X3n), the time series data of the ON / OFF state (1 / 0) of relay A (X41, . . ., X4n), the time series data of the ON / OFF state (1 / 0) of relay B (X51, . . ., X5n), and the actual measured value F of the room temperature gauge are acquired. The least squares method is applied to n points in a six-dimensional space, (X11,··,X51,Y1),···,(X1n,··,X5n,Yn), obtained from the time series data (Y1,··,Yn), to find the hyperplane Y=a0+a1X1+a2X2+a3X3+a4X4+a5X5 that passes closest in the least squares sense, and the values ​​of the constants a0, a1, a2, a3, a4, and a5 are determined.

[0035] Where: X0j:(j=1, ,n) X0j=1 X1j: (j=1, . . . , n): Time series data acquired at a predetermined time interval by the first temperature sensor 24 X2j: (j=1, . . . , n): Time series data acquired at a predetermined time interval by the second temperature sensor 16 X3j: (j=1, . . . , n): Time series data acquired at a predetermined time interval from the third temperature sensor 17 X4j: (j = 1, , n): Time series data of the ON / OFF state of relay A acquired at a specified time interval X5j: (j = 1, , n): Time series data of the ON / OFF state of relay B acquired at a specified time interval Yj: (j = 1, , n): Time series data of room temperature measurements taken at a given time interval Then, by applying the least squares method, the following equation (Equation 1) is established.

[0036]

number

[0037] Then, by substituting X0j=1, we obtain the following equation (Equation 2).

[0038]

number

[0039] If we multiply both sides from the left by the inverse matrix (call it R) of the 6 × 6 square matrix part on the left side, all the coefficients of the hyperplane can be obtained in the following form (Equation 3).

[0040]

number

[0041] The values ​​of the constants a0, a1, a2, a3, a4, and a5 can be obtained from the formula 3. The obtained constants a0, a1, a2, a3, a4, and a5 are stored in the memory 25.

[0042] Next, we will explain how to find the constants b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, and b10 in the "10-variable linear function." The constants b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, and b10 are also constants specific to the target floor heating controller, and similarly to the above "5-variable linear function," the constants b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, and b10 are found using a separate room temperature meter in the following procedure before controlling the room temperature with the floor heating controller 1.

[0043] In the case of a "linear function of 10 variables," data from 4 minutes prior is used, so while relay A and relay B are turned ON / OFF randomly at any timing, time series data of the first temperature sensor 24, the second temperature sensor 16, the third temperature sensor 17, the ON / OFF state of relay A (1 / 0), and the ON / OFF state of relay B (1 / 0) are obtained at specified time intervals for more than 4 minutes, and then time series data of the first temperature sensor 24, the second temperature sensor 16, the third temperature sensor 17, the ON / OFF state of relay A (1 / 0), the ON / OFF state of relay B (1 / 0) and the actual value F of the room temperature gauge are obtained n times at specified time intervals. Time series data of the first temperature sensor 24 (X11, ,X1n), time series data of the second temperature sensor 16 (X21, ,X2n), time series data of the third temperature sensor 17 (X31, ,X3n), time series data of the ON / OFF state of Relay A (1 / 0) (X41, ,X4n), time series data of the ON / OFF state of Relay B (1 / 0) (X51, ,X5n), time series data of the first temperature sensor 24 four minutes ago (X61, ,X6n), time series data of the second temperature sensor 16 four minutes ago (X71, ,X7n), time series data of the third temperature sensor 17 four minutes ago (X81, ,X8n), time series data of the ON / OFF state of Relay A (1 / 0) (X41, ,X4n), time series data of the ON / OFF state of Relay B (1 / 0) (X51, ,X5n), The least squares method is applied to n points in an 11-dimensional space, (X11,··,X101,Y1), ···, (X1n,··,X10n,Yn), which are obtained from the time series data of relay B's ON / OFF state (1 / 0) four minutes ago (X91,··,X9n), the time series data of relay B's ON / OFF state (1 / 0) four minutes ago (X101,··,X10n), and the time series data of the room temperature gauge actual value F (Y1,··,Yn).The values ​​of the constants b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, and b10 are determined by finding the hyperplane T=b0+b1X1+b2X2··+b8X8+b9X9+b10X10 that passes closest in the least squares method sense.

[0044] In the case of "linear function of 10 variables", an 11×11 square matrix is ​​used to calculate the constants b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, and b10, which are the time series data from 4 minutes ago (X61,··,X6n), (X71,··,X7n), (X81,··,X8n), (X91,··,X9n), and (X101,··,X10n) added to the above-mentioned "linear function of 5 variables". Since the calculation method is the same as that of the above-mentioned "linear function of 5 variables", details will be omitted here. The calculated constants b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, and b10 are stored in memory 25.

[0045] Next, we will explain how to find the constants c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, and c15 in the "15-variable linear function." The constants c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, and c15 are also constants specific to the target floor heating controller, and as in the case of the above "5-variable linear function," the constants c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, and c15 are found using a separate room temperature meter in the following procedure before controlling the room temperature with the floor heating controller 1.

[0046] In the case of a "15-variable linear function," data from 4 minutes and 8 minutes ago is used, so while relay A and relay B are turned ON / OFF randomly at any timing, time series data of the first temperature sensor 24, the second temperature sensor 16, the third temperature sensor 17, the ON / OFF state of relay A (1 / 0), and the ON / OFF state of relay B (1 / 0) are obtained for at least 8 minutes at specified time intervals, and then time series data of the first temperature sensor 24, the second temperature sensor 16, the third temperature sensor 17, the ON / OFF state of relay A (1 / 0), the ON / OFF state of relay B (1 / 0) and the actual value F of the room temperature gauge are obtained n times at specified time intervals.

[0047] Time series data of the first temperature sensor 24 (X11, ,X1n), time series data of the second temperature sensor 16 (X21, ,X2n), time series data of the third temperature sensor 17 (X31, ,X3n), time series data of the ON / OFF state (1 / 0) of relay A (X41, ,X4n), time series data of the ON / OFF state (1 / 0) of relay B (X51, ,X5n), time series data of the first temperature sensor 24 four minutes ago (X61, , X6n), time series data of the second temperature sensor 16 four minutes ago (X71,··,X7n), time series data of the third temperature sensor 17 four minutes ago (X81,··,X8n), time series data of the ON / OFF state (1 / 0) of relay A four minutes ago (X91,··,X9n), time series data of the ON / OFF state (1 / 0) of relay B four minutes ago (X101,··,X10n), time series data of the first temperature sensor 24 eight minutes ago (X111,··,X11n), The time series data of the second temperature sensor 16 8 minutes ago (X121, , X12n), the time series data of the third temperature sensor 17 8 minutes ago (X131, , X13n), the time series data of the ON / OFF state (1 / 0) of relay A 8 minutes ago (X141, , X14n), the time series data of the ON / OFF state (1 / 0) of relay B 8 minutes ago (X151, , X15n), and the time series data of the actual measured value F of the room temperature gauge (Y1, , Yn). The least squares method is applied to n points in the 16-dimensional space of (X11,··,X151,Y1),···,(X1n,··,X15n,Yn) to find the hyperplane T=c0+c1X1+c2X2··+c14X14+c15X15 that passes closest in the least squares sense, thereby determining the values ​​of the constants c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, and c15.

[0048] In the case of a "linear function of 15 variables," a 16x16 square matrix is ​​used to calculate the function, adding the time series data from 4 minutes ago (X61,··,X6n), (X71,··,X7n), (X81,··,X8n), (X91,··,X9n), (X101,··,X10n) and the time series data from 8 minutes ago (X111,··,X11n), (X121,··,X12n), (X131,··,X13n), (X141,··,X14n), (X151,··,X15n) to the "linear function of 5 variables" above. However, as the method of calculation is the same as for the "linear function of 5 variables" above, details will be omitted here. The determined constants c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, and c15 are stored in memory 25.

[0049] As described above, the constants a0, a1, a2, a3, a4, a5 in the "linear function of five variables", the constants b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10 in the "linear function of ten variables", and the constants c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15 in the "linear function of 15 variables" can be calculated. These calculated constants were determined based on the ON / OFF states of three temperature sensors in different environments, Relay A and Relay B, which are heat-generating switching elements that are a major cause of temperature rise inside the controller, and also on the correlation between past data (4 minutes ago, 8 minutes ago) and the actual measured value of the room temperature gauge. Therefore, by using Equations A, B, and C, which are room temperature estimation formulas that use these constants as described above, it is possible to estimate the room temperature more accurately, even in the case of a wall-mounted controller that is affected by disturbances due to outdoor temperature changes, and it is possible to keep the error in the (estimated) room temperature within an acceptable range.

[0050] Here, the floor heating controller 1 is an example of a floor heating controller, the first temperature sensor 24 is an example of a first temperature sensor, the second temperature sensor 16 is an example of a second temperature sensor, the third temperature sensor 17 is an example of a third temperature sensor, the memory 25 is an example of a memory, and the relay A and relay B 25 are examples of heat-generating switching elements.

[0051] Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention should not be construed in any way as being limited by the specific descriptions in the embodiments. It should be understood that the present invention can be embodied in various forms that include various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art, and that all such embodiments are included within the scope of the present invention as long as they do not deviate from the spirit of the present invention.

[0052] For example, in this embodiment, two pieces of data, one 4 minutes ago and one 8 minutes ago, are used as past data, but the past data is not limited to this, and valid past data (time and number) can be appropriately set depending on the characteristics of the floor heating controller that estimates the room temperature.

[0053] In addition, in this embodiment, as described above, within 4 minutes after the power is turned on, the least squares method is applied to n points in a 6-dimensional space, and the hyperplane Y=a0+a1X1+a2X2+a3X3+a4X4+a5X5 passes closest in the least squares method sense; between 4 minutes and 8 minutes after the power is turned on, the least squares method is applied to n points in an 11-dimensional space, and the hyperplane T=b0+b1X1+b2X2··+b8X8+b9X9+b10X10 passes closest; and 8 minutes or more after the power is turned on, the least squares method is applied to n points in a 16-dimensional space, and the hyperplane T=c0+c1X1 passes closest in the least squares method sense. Although a method for estimating the room temperature by calculating +c2X2··+c14X14+c15X15 has been presented, the method for estimating the room temperature is not limited to the above-mentioned method. In a wall-embedded floor heating controller, when estimating the room temperature, it is important to use the three temperature sensors in different environments, the ON / OFF state of relay A and relay B, which are one of the heat-generating switching elements that are a major cause of the temperature rise inside the controller, as in this embodiment, and further past data (for example, 4 minutes ago and 8 minutes ago in this embodiment), and the method for estimating the room temperature using these data may be other methods, such as approximation formulas. [Explanation of symbols]

[0054] 1. Floor heating controller 10. Front section 11 Body cover 12...Display device 13...Operation panel 14 Operation cover 15 Control board 16 Second temperature sensor 17··Third temperature sensor 18··Ventilation hole 19. Power switch 20 Rear section 21 Bottom cover 23 Power supply board 24··First temperature sensor 25 Memory

Claims

[Claim 1] A wall-embedded floor heating controller for controlling indoor temperature includes: a first temperature sensor disposed within the controller at an interior location of the wall to detect a temperature within the controller at that location; a second temperature sensor that is disposed in the controller on the indoor side outside the wall and in a central portion of the controller and detects a temperature inside the controller at that position; a third temperature sensor that is disposed inside the controller on the indoor side outside the wall and on an outer periphery of the controller and detects a temperature inside the controller at that position; a memory for storing past detected temperatures detected by each of the first temperature sensor, the second temperature sensor, and the third temperature sensor at a predetermined time interval; a heat-generating switching element for controlling the temperature (by turning on / off the current flowing through the heater); A floor heating controller characterized by having a calculation means for estimating room temperature using the past detected temperatures of the first temperature sensor, the second temperature sensor and the third sensor stored in the memory, the current detected temperatures of each sensor, and the ON / OFF status signal of the heat-generating switching element.

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